In PostgreSQL, the CONCAT() function concatenates the text representations of its arguments.
DBMS
Database Management Systems
7 Options for Enabling Pipes (||) as the Concatenation Operator in MariaDB
By default, two pipe characters (||) are treated as a logical OR operator in MariaDB. However, you can change this behaviour if you like.
You can update your sql_mode to include the PIPES_AS_CONCAT option, in which case two pipes will be treated as a concatenation operator.
There are quite a few ways to add this option to your sql_mode. You can add it explicitly. Or you can set your sql_mode to an option that sets it implicitly.
I run through these options below.
How to Extract the Day, Month, and Year from a Date in SQLite
In SQLite, we can use the strftime() function to return datetime values in our chosen format.
Therefore, we can use it to extract the day, month, and year from a date.
How to Format Numbers with a Minus/Plus Sign in Oracle
When using the TO_CHAR() function to format a number in Oracle Database, you can use the S format element to return its sign (i.e. a plus sign for positive values, and a minus sign for negative values).
You can also use the MI format element to return negative values with a trailing negative sign, and positive values with a trailing blank.
How to Enable the Pipe Concatenation Operator in MySQL
MySQL supports the use of the pipe concatenation operator (||) for concatenating its operands. However, you need to enable it first.
3 Functions that Get the Day, Month, and Year from a Date in PostgreSQL
PostgreSQL provides us with several ways to get the day, month, and year from a date.
Three functions that immediately come to mind are; DATE_PART(), EXTRACT(), and TO_CHAR().
Export Query Results to an XML File when using SQLcl (Oracle)
When using SQLcl with Oracle Database, you can export your query results to an XML file with the SPOOL command.
Format a Number as Currency in MariaDB
Here’s an example of formatting a number as currency in MariaDB.