SELECT TRUNC(datevalue, 'IW') AS TRUNCVALUE This example uses TRUNC to show the date value as an IW format (which is the week number in a year). It looks to be the same value that is returned, because the provided value is already a day/month/year type. SELECT TRUNC(datevalue, 'DD') AS TRUNCVALUE This example uses TRUNC on a date to truncate it to a day. It shows a similar result, converting the date to a month and year value, which changes the day to the first of that month. SELECT TRUNC(datevalue, 'MONTH') AS TRUNCVALUE This example uses TRUNC on a date to truncate it into a month. It shows the date value converted to a year, which is the first day of the first month of the year. SELECT TRUNC(datevalue, 'YEAR') AS TRUNCVALUE
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This example shows how to use TRUNC on a date to truncate it to a year. SELECT datevalue, timestampvalue FROM datelist DATEVALUEĪnd yes, it is about 6AM when I’m writing this post! Example 1 INSERT INTO datelist (datevalue, timestampvalue) VALUES (SYSDATE, SYSTIMESTAMP) These examples use a table called “datelist” that I created using the following code: CREATE TABLE datelist ( I find that examples are the best way for me to learn about code, even with the explanation above. Here are some examples of the TRUNC function. If you want to remove characters from a string data type, you can use the SUBSTR function No, you can’t use the Oracle TRUNC function on a string data type. See below for some examples on using TRUNC with TIMESTAMP.
If you are unable to use TRUNC on timestamps in your version, you can CAST it to a DATE first: TRUNC(CAST(TIMESTAMP as DATE)) Before this version, you got an error (ORA-00932: inconsistent datatypes: expected NUMBER got TIMESTAMP). You can then truncate it to the format you need.Īs of Oracle version 9 (version 9.2.0.3 I believe), you can perform TRUNC on timestamp. The DATE version of the TRUNC function accepts any date data type, including timestamp. See below for more examples about using TRUNC with SYSDATE. You can use it by simply running: TRUNC(SYSDATE) It’s useful to get the current date, without the time, by using the SYSDATE keyword. The Oracle TRUNC function is often used on the SYSDATE keyword. You can specify these as part of the second parameter when using the TRUNC function on dates. These are the available format values for using the TRUNC function on dates. If you do specify the decimals, then it returns a data type of NUMBER. If you use the number version of the TRUNC function, then the returned value is the same as the number parameter if you don’t specify the decimals. If you use the date version of the TRUNC function, then the value returned is always of datatype date, even if you use a different datetime datatype as the parameter. If it is omitted, number is then truncated to a whole number (0 decimal places). If it is positive, digits to the right are truncated, and if it is negative, digits to the left are truncated. decimals (optional): This is the number of places to the left or right of the decimal point to truncate the number value.number (mandatory): This is the numeric value that is to be truncated.The parameters of the Oracle TRUNC function for numbers are: See below for the valid format parameters that can be used. If it is not specified, then the function will truncate the date value to the nearest day.
fmt (optional): This is the format that the date value is to be truncated to.date (mandatory): This is the date or datetime value that is to be truncated or reduced to.The parameters of the Oracle TRUNC function for dates are: Let’s take a look at the parameters for this function. Using a number, the syntax is: TRUNC( number, decimals ) Using a date value, the syntax is: TRUNC( date, fmt ) The syntax of the TRUNC function is slightly different, depending on which data format you’re supplying. If you supply it a numeric data type, it will round the number to the specified number of decimal places. If you supply it a date data type, then it will return the portion of that value as specified by your format model. This means you can provide it with either of these two data types, and the TRUNC function will perform slightly differently and give you a result for that data type. The TRUNC function works on two different data types – number or date. The purpose of the Oracle TRUNC function is to truncate either a number or a date value. Let’s take a look at how it’s used and some examples. The TRUNC function is one of the most common and versatile functions in Oracle.
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