Categories: Date/Time. In general, window functions can be grouped into 3 types: Navigation functions: Return the value given a specific location criteria (e. Semi-structured Data Types. Semi-structured Data Types. 000. Snowflake: Convert different unix time formats to datetime. Statement2: select count (*) from table1 before (timestamp =>to_timestamp_ltz ( '2018-09-24 11:30:00')) 2. Snowflake supports creating temporary tables for storing non-permanent, transitory data (e. 2 days, but Snowflake will produce 1 because 2 is 1 more than 1. The timediff () function takes exactly two arguments which are both time values. I did some research and found articles in the FAQ part of the community - For the 2-argument version: The source_timestamp argument is considered to include the time zone. 0. The default setting for this parameter is YYYY-MM-DD HH24:MI:SS. 57. 3. Add a comment. The number of rows backward from the current row from which to obtain a value. Accept. I have a date in YYYY-MM-DD format and want to convert this in UNIX time in snowflake. All these accept input as, Date type, Timestamp type or String. start, c1. Snowflake timestamp conversion issue. DATE : calendar date (e. 852000000` or ending with `2019-05-10 06:59:31. "MyColumn") in which case it will create the column names with the exact case specified. These functions allow BigQuery users to handle Date and Time Datatypes. For example if you want to add 2 days, then this will be DAY. If not specified, the default is to use. The functions in this section use a format string that is compatible with JodaTime’s DateTimeFormat pattern format. In PostgreSQL, you can take the difference in years, multiply by 12 and add. I have used TO_TIMESTAMP and TO_DATE functions in SELECT query and not able to print the expected result. In a non-leap year period, the DATE_DIFF. What's the correct way to define ISO datetime's data type in Snowflake? I tried date, timestamp and TIMESTAMP_NTZ like this in my dbt sql script: JSON_DATA:",my_date"::TIMESTAMP_NTZ AS MY_DATE but clearly, these aren't the correct one because later on when I test it in snowflake with select * , I get this error: A common SQL query WHERE clause is to just pull the data for the last n seconds. Calcule la différence entre deux expressions de date, d’heure ou d’horodatage en fonction de la partie de date ou d’heure spécifiée. 13. Current best Snowflake query. slice_length. In general, window functions can be grouped into 3 types: Navigation functions: Return the value given a specific location criteria (e. As such, they are not visible to other users or sessions. And the timestamp_ntz (no. Use this tool to check exactly when someone made their Discord account (profile), when a Discord server was made, or even exactly when any Discord message was sent. milliseconds or nanoseconds) since the start of the Unix epoch (1970-01-01 00:00:00 UTC). Add this example script to your app and run it. e. net. 1. The following parameters define the formats for date and time output from Snowflake: DATE_OUTPUT_FORMAT. In addition, all accepted TIMESTAMP values are valid inputs for dates; however, the TIME information is truncated. In this case, we can make use of TIMESTAMP_DIFF and CURRENT_TIMESTAMP: SELECT date, TIMESTAMP_DIFF (CURRENT_TIMESTAMP(), date, SECOND) AS seconds_since FROM ( SELECT TIMESTAMP_SUB (CURRENT_TIMESTAMP(), INTERVAL 30 SECOND) AS. 3 @dependabot Bump maven-shade-plugin from 3. There are 3 different timestamp types in Snowflake:Unsure if anybody has ever found a better solution or if Snowflake has put something in but I haven't found it. select(sum(df. 0000000 and the result should be "2022-10-18 12:10:36". 098 you want 2023-10-18. Definition and Usage. I'm guessing that Trino also looks at the difference in hours between the two timestamps to approximate the result down if it's less than 24 hours. ISO Weeks¶. 000 . A date to be converted into a timestamp. TIMESTAMP_TZ. Unfortunately any c. There are 3 different timestamp types in Snowflake: TIMESTAMP_LTZ Which Datatype Should I Use? In all, your safest bet is usually to go with TIMESTAMP_TZ for storing your data. If this value is then converted to TIMESTAMP_NTZ in Snowflake, the user sees 18:00:00, which is different from the original value, 12:00:00. How can get a list of all the dates between two dates (current_date and another date 365 days out). You can use these interval literals in conditions and calculations that involve date-time expressions. Because of the variety of ways the string field can be ordered, the <date_format> must match exactly. 520 and another column that looks like this 06:00:00. numeric-expression. Geospatial Data Types. For example, if you want to add 2 days to August 1, 2018, then this will be '2018-08-01'::DATE. In SQL Server I can do this using recursive SQL but looks like that functionality is not available in Snowflake. to specify the time with a precision of milliseconds). I seem to get the same result for the query as a stand-alone. I'd recommend familiarizing yourself with the three different kinds of timestamps. To convert an epoch value to a UTC timestamp in Snowflake, you can use the TO_TIMESTAMP function. ETL data, session-specific data). To use the Timestampdiff function to get accurate results, you need to calculate the difference in days using a smaller time parameter, e. now(tz=timezone. Unfortunately any code I try to. TIMESTAMP_DIFF Description Returns the number of whole specified date_part intervals between two timestamps. 32 to 3. If it has trouble, you can also give it a hint by providing input formatting preferences. working_day_start_timestamp else t. This should be an integer. Snowflake is a Cloud Data Warehousing and Analytics Platform that enables independent instant. In both cases above the output timestamp is epoch timestamp corresponding to the CURRENT_DATE (which is the current time in the snowflake account time zone). 0. The setting of the TIMEZONE session parameter affects the return value. Snowflake unable to convert an unexpected date format to the international standard. 848 -0400' - 2 hours Snowflakeは、週に関連する特別な一連の日付関数（および同等のデータ部分）を提供し、その動作は DAYOFWEEKISO 、 WEEKISO 、 YEAROFWEEKISO の ISO 週のセマンティクスと一致しています。. We have ended up moving back to TIMESTAMP_NTZ to avoid this issue. Temporary policy: Generative AI (e. When comparing timestamps in our databases to CURRENT_TIMESTAMP Snowflake returns weird results. The units are used is a Date part ( year, month, date ) or Time part (hours, minute, second) only relevant parts will be used. Usage Notes¶. 9857574 AM. start <= w. The Snowflake INTERVAL functions are commonly used to manipulate date and time variables or expressions. support multiple formats for implicit date imestamp conversion. Modified 5 years ago. timestamp_expr. no additional licensing is required; however, standard Time Travel is 1 day. e. For example, you can use interval data type functions to add years, months, days, hours, etc to the timestamp variables. See the Notes section for unsupported features. For example, the value in the column is 20221018121036. the warehouse metering history is providing information on how many credits a warehouse consumed in an hour. VARIANT. Alternative for DATE_TRUNC. The first argument must be a built-in data type of either INTEGER or SMALLINT. unsubscribe here or customize. For EDITDISTANCE, unlike EDIT_DISTANCE_SIMILARITY lower scores are closer matches. However then you need to convert this into the hour, minutes and seconds. Modified 3 years, 5 months ago. 2. For example it converts ‘2286-08-27 00:00:00. e. Snowflake support responded as follows: As per my investigation and internal research, the behaviour mentioned by you is a known one. February 28 and March 31) can lead to unintuitive behavior; specifically, increasing the first date in the pair does not always increase the output value. *) returns the number of rows that do not contain any NULL values. Workaround 1 ) alter user <username> set timezone='UTC'; select CURRENT_TIMESTAMP (); Workaround 2) alter session set timezone=‘UTC’; select CURRENT_TIMESTAMP ();Actually Simeon, it not a bad question, there are no such things as bad question. 1 to 1. rank) to each row based on their position in the specified window. For example, if you want to add 2 days to August 1, 2018, then this will be '2018-08-01'::DATE. Floating-point values can range from approximately 10 -308 to 10 +308. More generally, swapping the inputs reverses the sign: MONTHS_BETWEEN(d1, d2) = -MONTHS_BETWEEN(d2, d1). This was very helpful. Function does this is MySQL: UNIX_TIMESTAMP('1999-01-22') MySQL output 916988400. CONVERT_TIMEZONE ( <target_tz> , <source_timestamp> ) but you are doing ( <source_timestamp>, <target_tz>) Also the - INTERVAL '5 HOUR' appears the same as "to UTC for the current not in Daylight savings time", it would seem safer to use the complete version of CONVERT_TIMEZONE to do the to UTC part. snowflake::query ("alter session set. In the following example, the TIMESTAMP_TYPE_MAPPING parameter is set to TIMESTAMP_LTZ (local time zone). Snowflake SQL query for JSON data unix time conversion. If the value is not a CHAR or VARCHAR data type, it is implicitly cast to VARCHAR before evaluating the function. Each one of the timestamp variations, including the TIMESTAMP alias, provides support for an optional precision parameter for fractional seconds, e. 13. cnf. In SQL Server, you can convert this to a floating point date serial number (days since 1900-01-01): select convert (float, my_timestamp_field) as float_serial_number. The convert should get you to UTC, regardless of what timezone your Snowflake instance is set to by default. 663 3 3 silver badges 11 11 bronze badges. 1 Answer. These functions are alternatives to using the DATE_PART (or EXTRACT) function with the equivalent time part (see Supported Date and Time Parts). Ask Mike anything about becoming a Data Superhero, building ML models, his journey as a global nomad, and more!There is no difference. SUBSTR ('abc', 1, 1) は、「b」ではなく「a」を返. 1. Setup access to Snowflake Marketplace data. (More extreme values between approximately 10 -324. 0. For both DATEDIFF and minus sign: Output values can be negative, for example, -12 days. Date and time values can be stored as. Write resolution instructions: Use bullets, numbers and additional headings Add Screenshots to explain the resolution Add diagrams to explain complicated technical details, keep the diagrams in lucidchart or in google slide (keep it shared with entire Snowflake), and add the link of the source material in the Internal comment section Go in depth if required Add links and other resources as. g. For better pruning and less storage consumption, Snowflake recommends flattening your object and key data into separate relational columns if your semi-structured data includes: Dates and timestamps, especially non-ISO 8601 dates and timestamps, as string values. select to_timestamp ( round ( date_part (epoch_second, to_timestamp ('2020-10-10 17:51:01'))/1800 )*1800) nearest_half_hour # 2020-10-10T18:00:00Z. 0 @dependabotThe ever-increasing demand for Efficient Data Handling & Processing has reached a new peak. Create a Python UDF to convert temperature. not quite. Extracts the corresponding time part from a time or timestamp value. date_or_time_part must be one of the values listed in . Returns. How to get difference betwen these below two dates in snowflake. mysql> SELECT TIMESTAMPDIFF (MINUTE,'2003-02-01','2003-05-01 12:05:55'); -> 128885. milli second and nano second precision applicability while loading data. YEAR* / DAY* / WEEK* / MONTH / QUARTER¶. However then. In Snowflake, you will need to run the TIMEDIFF /TIMESTAMPDIFF command with date part of "SECOND" so you do not lose any precision. TIMEDIFF function Arguments. It is easy for humans to read and write. Alias for DATEDIFF. Applies to: Databricks SQL Databricks Runtime 10. below query doesn't work, is there any other way ? Alter table case_copy. to_char converts a date using a format. Snowflake. select datediff (qtr, '1998-07-01', current_date); date_diff ----------- 40 (1 row) The following example joins the SALES and LISTING tables to calculate how many days after they were listed any tickets were sold for listings 1000 through 1005. TIMESTAMPDIFF Description Calculates the difference between two date, time, or timestamp expressions based on the specified date or time part. 75) WITHIN GROUP (ORDER BY WINDSPEED) "Q3" from PUBLIC. In this example, the local time zone is US Pacific Standard Time (-08:00 relative to. For example, if you want to add 2 days to August 1, 2018, then this will be '2018-08-01'::DATE. My org is in the process of transitioning from Redshift to Snowflake and I would like to ask if there is a neater way of truncating a timestamp field to extract just the date out of it as I would do it in Redshift. One month is considered elapsed when the calendar month has increased and the calendar day and time is equal or greater to the start. Date difference is 23, if you are counting number of different days. Actually, the marked answer originally produced wrong results for milliseconds 1 - 99: Example 1 second, 27 milliseconds: DATEDIFF % 1000 will return 27. Redirecting. g. to get a cleanly formatted duration like you might in PostgreSQL you have to roll your own functions. To calculate the difference between two timestamps, convert them to unix timestamps then subtract: Master date and time queries in Snowflake with our. datediff. Snowflake's Time Travel feature is a wonderful way to save data that was either deleted or lost accidentally in the past. This information could be accurate to the microseconds. How to convert UNIX Epoch to date in Snowflake. This example shows how the first value converted can control whether the subsequent values are interpreted as seconds or milliseconds: CREATE TABLE demo1 ( description VARCHAR, value VARCHAR -- yes, string rather than bigint );I believe Default Snowflake System Timezone is configured to use Pacific Time Zone. There are 3 different timestamp types in Snowflake: TIMESTAMP_NTZ. TIMEDIFF. Usage Notes¶. 0. 2020-01-01 13:04:11-5:00) TIME : a time as seen on a watch (e. Create and fill a table. It is easy for machines to parse and generate. DATEDIFF とマイナス記号の両方の場合: 出力値は、-12日などの負の値にすることができます。. Only integers are accepted, i. 805' as time_string, to_timestamp (time_string) as a_timestamp,. @markpytel ,. date_or_time_expr. If you want to mimic hive logic in snowflake, you should use below code -. (with that said, I wouldn't recommend this type of int representation for a date) Share. date_or_time_expr must evaluate to a date, time, or timestamp. A number of seconds (if scale = 0 or is absent) or fractions of a second (e. The function allows you to calculate time differences in units other than seconds, such as years, months, or. Note: If there are specified two arguments with this function, it first adds the second argument to the first, and then returns a datetime value. This returns a timestamp for each 15-minute interval between midnight and 12 PM on April 1. Difference between two timestamp with all elements of dates-1. That is correct: Unlike other databases, MVIEWS in Snowflake are a very targeted and simplified feature. Syntax: DATEPARSE(date_format, date_string) Output: Date: Definition: The <date_format> argument describes how the <date_string> field is arranged. 日時がパーティションキーとして利用することが多いため、日時関数を使用する機会が多いはずです。. For more. From fetching the current timestamp to calculating date differences, we've got you covered. 000000 (1078 is difference in. i want to subtract time from datetime so my result should look like 2021-11-25 8:48:39. skarphol1 (Snowflake) for their quick replies. GEOGRAPHY. FF3 TZHTZM. This function is similar to CURRENT_TIMESTAMP, except that: It returns the current timestamp in the UTC time zone, whereas CURRENT_TIMESTAMP returns the timestamp in the local timezone. Paste in a Discord snowflake to get the timestamp. I'd recommend familiarizing yourself with the three different kinds of timestamps. On desktop, click the ⚙ button next to your name and look in the Advanced tab. extract a certain part from a timestamp, in the example below. What's the correct way to define ISO datetime's data type in Snowflake? I tried date, timestamp and TIMESTAMP_NTZ like this in my dbt sql script: JSON_DATA:",my_date"::TIMESTAMP_NTZ AS MY_DATE but clearly, these aren't the correct one because later on when I test it in snowflake with select * , I get this error:A common SQL query WHERE clause is to just pull the data for the last n seconds. The value is expected to be the result of subtracting two timestamps and converting the result to CHAR. g. 27' which means 270ms rather than 27ms. An OBJECT can contain semi-structured data. Redirecting to - Snowflake Inc. Snowflake SQL: trying to calculate time difference between subsets of subsequent rows. AMA WITH MIKE TAVEIRNE Exciting news! Data Superhero, Mike Taveirne, is in forums from Sept 26-29 to answer your questions. Three quotes from the manual: 1. , appropriate winter tires are defined as those with either the M+S (mud and snow) or mountain/snowflake symbol, in good condition with a minimum tread depth. Variations of Timestamp. ARRAY. Snowflake server, split duration by hour? 4. For example in current database the record is: 10-AUG-10 05. For example, an offset of 2 returns the expr value with an interval of 2 rows. Hi @nehan Can you check the below one:date_trunc¶. Snowflake datatype is timestamp_ntz(0) In the ETL gave date pattern as "yyyy-MM-dd HH:mm:ss" for both source and target . Data Types. Use only the TIMESTAMP_LTZ data. ‘HEX’, ‘BASE64’ or ‘UTF-8’). If not specified, the default is to use the TIMESTAMP_OUTPUT_FORMAT parameter setting. In snowflake: CAST(Last_Modified_Date as timestamp)+cast(last_modified_Tm as timestamp) Iam getting issue with converting time to timestamp, can you help. Syntax DATEDIFF(endDate string, startDate string) → integer endDate: A DATE or TIMESTAMP expression. Snowflake data warehousing is designed to work with Snowflake-specific SQL syntax. Sorted by: 8. 0. Moving averages. This is the date, time, or timestamp to which you want to add. Creating a temporary table in Snowflake. This is the date or timestamp expression to which you want to add a specified number of months. It is a POSIX timestamp corresponding to the datetime instance. Accepts relevant date and time parts (see next section for details). sql_tsi_minute. Examples¶. DATE accepts dates in the most common forms (YYYY-MM-DD, DD-MON. Conversion. You. Update: You can now use the GENERATE_TIMESTAMP_ARRAY function in BigQuery. TIMESTAMPDIFF. Snowflake creates column names in upper case regardless of how they are written *unless* the original create statement puts the columns names in double quotes (e. DATEDIFF function in Snowflake - SQL Syntax and Examples Let's compare the most important features of star and snowflake data warehouse schemas. Default is 1. Dean Flinter Dean Flinter. 引数¶ date_or_time_part. Source datatype is datetime . However, unlike time travel, it should not be considered as a part of your organization’s backup. To summarize, Snowflake recommends strictly following at least one of these rules: Use the same time zone, ideally UTC, for both Spark and Snowflake. If not specified, the default is to use the TIMESTAMP_OUTPUT_FORMAT parameter setting. On the ingestion side, Snowflake can take any suitable timestamp string (single quotes) wherever a timestamp is needed and will try to parse it. The function returns the start or end of the slice that contains this date or time. 123 segundos, não 1. PostgreSQL - Date Difference in Months. Load *, Timestamp (Timestamp# (String)) as TS; LOAD * INLINE [. Histograms count the number of values that fall in a certain bin, so the first thing we'll do is create our bins. Otherwise, the current session time zone is used. DATEDIFF(WEEK, START_DATE, END_DATE) will count number of Sundays between two dates. Precision. In a key-value pair, the key should not be an empty string, and neither the key nor the value should be NULL. 7. which yields an output of: float_serial_number. TIME は、 TIME（3）などの小数秒のオプションの精度パラメーターをサポートします。時間精度の範囲は、0（秒）から9（ナノ秒）までです。Usage Notes¶. g. These features are included standard for all accounts, i. An expression that returns a value of built-in CHAR or VARCHAR data type. Create a temp table that contains the start and end dates of the date range so that you can calculate a date diff from the start and end dates. I can resolve this by changing the account parameter TIMESTAMP_TYPE_MAPPING to LTZ. The schema is SYSIBM. How to calculate the time difference in format hh:mm:ss. The strftime () function also takes a format string as its first argument. In case of NULL input it will result in to NULL. 1. DATEADD function Arguments date_or_time_part. The following examples show how to use the TO_DATE () function. 000. The maximum length of an OBJECT is 16 MB. The expression must be of type DATE or TIMESTAMP_NTZ. 000'::Timestamp_TZ, 'yyyy-mm-dd hh:mi:ss') 2021-07-19 02:45:31. Precision is approximately 15 digits. To Here is an example of changing a TIMEZONE at the session level: ALTER SESSION SET. Truncates a DATE, TIME, or TIMESTAMP to the specified precision. ; ExamplesIf you haven't started writing an app with snowflake, it reads like a lot of a smoke. Sriganesh Palani (TechMahindra Limited) 4 years ago. The setting of the TIMESTAMP_TYPE_MAPPING parameter does not affect the return value. I have a string field names Start_Time with value such as '1/20/23 15:05:45'. The default is month. alter session set timestamp_output_format = 'YYYY-MM-DD HH24:MI:SS' UPDATE table SET TIMESTAMP=current_timestamp. g. answered Apr 5 at 20:03. The difference between TZ and LTZ comes from the offset set in the database, meaning that even if the displayed offset is +0019 (19 minutes), the difference is <60 seconds. For DATEDIFF: date_or_time_expr1 and date_or_time_expr2 can be a date, time, or timestamp. TIMEDIFF function in Snowflake - Syntax and Examples. ; TIMESTAMP: for year,. Histograms count the number of values that fall in a certain bin, so the first thing we'll do is create our bins. Summary Statistics. In Teradata we can simply subtract two timestamp but in snowflake I am not able to do that. Snowflake stores data in files that are immutable, and encrypted, as part of our architecture. extract a certain part from a timestamp, in the example below. A number of seconds (if scale = 0 or is absent) or fractions of a second (e. TIMESTAMP_TZ. In this case, we can make use of TIMESTAMP_DIFF and CURRENT_TIMESTAMP: SELECT date, TIMESTAMP_DIFF (CURRENT_TIMESTAMP(), date, SECOND) AS seconds_since FROM ( SELECT TIMESTAMP_SUB (CURRENT_TIMESTAMP(), INTERVAL 30 SECOND) AS date UNION ALL ( SELECT TIMESTAMP_SUB. Minute uses the hour and minutes from the time. In order to get the integer part of Impala's MONTHS_BETWEEN using Snowflake functions we apply the following logic : IFF (DAY (DATE1) >= DAY (DATE2), DATEDIFF ('month', DATE2, DATE1), DATEDIFF ('month', DATE2, DATE1) - 1) In order to get the fractional part of Impala's MONTHS_BETWEEN using Snowflake functions we. TIMESTAMPDIFF function Syntax TIMESTAMPDIFF(. 何かと便利なので覚えといて損はないと思います。. October 10, 2023. The function returns the result of. An operator manipulates any number of data inputs, also called operands, and returns a result. g. Screenshot 2: a ticket has been created definitely before the current local timestamp, however when using a case when statement (greater condition) to compare both timestamp Snowflake returns the current_timestamp as the greater one;. An expression that returns a value that is a built-in. 000’) into datetime64[ns] values. Hi, I'm new to Snowflake. When date_part is week (or any. Expand Post. Provide Project/Restrict on high use columns/rows. Converting the timestamp in Snowflake. g. Allows a time to be “rounded”. When data in a table is modified, deleted or the object containing data is dropped, Snowflake preserves the state of the data before the update. If a non-integer decimal expression is input, the scale of the result is inherited. Like. Querying, cloning, and restoring historical data in tables, schemas, and databases for up to 90 days through Snowflake Time Travel. However, taking your example literally, Snowflake would output minus 3 weeks from the start of "this week" DATEADD(WEEK, -3, DATE_TRUNC(WEEK,GETDATE())) Share. tz, ntz, tz = ntz AS wrong, convert_timezone('UTC', tz) = ntz AS still_wrong. The TIMEZONE parameter is set to. Temporary tables only exist within the session in which they were created and persist only for the remainder of the session. Snowflake does not have something like a ROWID either, so there is no way to identify duplicates for deletion. For example, We want to get the difference between Jan 10th 2021 and Jan 25th 2021, then the resultant. TIMESTAMPDIFF. Pivot Tables. parse_datetime(string, format) → timestamp with time zone. Here's an example: SELECT TO_TIMESTAMP ( 1618302181) AS utc_timestamp; In this example, the epoch value 1618302181 is converted to the UTC timestamp 2021-04-13 13:49:41. "Day Date") similarly we can write the formulas using different intervals based on the date format in. The first timestamp_expression represents the later date; if the first timestamp_expression is earlier than the second timestamp_expression , the output is negative. Note that TIMESTAMPDIFF returns a signed integer value, and. For the 3 argument version. これらの関数（および日付部分）はセッションパラメーターを無視します. This is also referred to. The TIMESTAMP () function returns a datetime value based on a date or datetime value. java8 to 5. #. Timestamp Datatypes in Snowflake. Snowflake Change Data Capture (CDC) is a technique used to track and capture data changes from source databases and transmit them to Snowflake. これらの関数（および日付部分）はセッションパラメーターを無視します. Sunday's Snowflakes - Alembika. Hi @JustineMit - if an answer helps you, please upvote and/or accept it. *, min (date) over (partition by cardid) as min_date from t ) t where legit = 0 and date < min_date + interval '10 day. Snowflake stores DATE and TIMESTAMP data more efficiently than VARCHAR, resulting in better query performance. A key component of Snowflake Time Travel is the data retention period. end) as elapse from c1) df Note of caution: You will get very close to the actual number of hours but may be a few decimal points off. ; I am calling that Snowflake procedure, using Snowpark session. Expand Post. July 14, 2023. Improve this answer. Only works for string expressions. Snowflake uses double-precision (64 bit) IEEE 754 floating-point numbers. The TIMESTAMPDIFF function returns an estimated number of intervals of the type that is defined by the first argument, based on the difference between two timestamps. You really should be using DateTimeOffset when dealing with timezones and data comparisons. These functions are alternatives to using the DATE_PART (or EXTRACT) function with the equivalent time part (see Supported Date and Time Parts). 4. It is possible to temporarily add a "is_duplicate" column, eg.