When using Oracle Database, you can use the TO_CHAR(datetime) function to return various parts of a datetime value, including the fractional seconds.
To return the fractional seconds part from a datetime value, use the FF format element.
Category: DBMS
Database Management Systems
NULLIF() Function in Oracle
In Oracle Database, the NULLIF() function compares two expressions, and returns null if both expressions are equal. If they are not equal, then the function returns the first expression.
NVL2() Function in Oracle
In Oracle Database, the NVL2() function allows us to replace null values with another value.
It’s similar to the NVL() function, except that it accepts three arguments instead of two. This allows us to specify a different value to return in the event the first argument is not null.
NVL() Function in Oracle
In Oracle Database, the NVL() function allows us to replace null values with another value.
MariaDB Composite Date & Time Units Explained
MariaDB includes a bunch of date and time units that you can use when working with date and time values. For example, MONTH is a unit, and HOUR is another unit.
Some units are composite units. Composite units are when two units get combined into one. The naming convention is that each unit name is separated by an underscore. For example, MINUTE_SECOND is for minutes and seconds.
Below are some examples that demonstrate how composite units work in MariaDB.
Continue readingCOALESCE() Function in Oracle
In Oracle Database, the COALESCE() function returns the first non-null expression the expression list.
How to Add the AD/BC Indicator to a Date in Oracle
When using the TO_CHAR() function to format a datetime value in Oracle Database, you can add the AD/BC indicator by simply adding either AD or BC to your format model.
Oracle then displays the appropriate indicator, depending on whether the date value is AD or BC.
You can provide it in any uppercase or lowercase, and with or without dots (e.g. AD, A.D. ad, a.d, etc). Oracle will then display the indicator as specified.
2 Functions that Return the Seconds from a Datetime Value in Oracle
Below are two functions that can be used to return the seconds portion from a datetime value in Oracle Database.
Continue readingHow to Format Dates in Oracle
This article contains common examples of formatting dates in Oracle Database.
Continue readingMariaDB FLOOR() vs TRUNCATE()
MariaDB has a FLOOR() function and a TRUNCATE() function that can return the same results or different results, depending on the exact value of their arguments.
Below is a quick rundown on the difference between FLOOR() and TRUNCATE() in MariaDB.