In MariaDB, the SUM() aggregate function returns the sum of a given expression.
It can also be used to return the sum of all distinct (unique) values in an expression.
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MIN() Function in MariaDB
In MariaDB, MIN() is an aggregate function that returns the minimum value in a given expression.
MAX() Function in MariaDB
In MariaDB, MAX() is an aggregate function that returns the maximum value in a given expression.
2 Ways to List all Functions in MariaDB
Below are two options for returning a list of functions in MariaDB.
Continue readingSQL LPAD()
In SQL, LPAD()is a commonly used function that pads the left part of a string with a specified character. The function can be used on strings and numbers, although depending on the DBMS, numbers may have to be passed as a string before they can be padded.
DBMSs that have an LPAD() function include MySQL, MariaDB, PostgreSQL, and Oracle.
DBMSs that don’t have an LPAD() function include SQL Server and SQLite (although there are other ways to apply left padding in these DBMSs).
SQL RPAD()
In SQL, RPAD()is used to pad the right part of a string with a specified character. The function can be used on strings and numbers, although depending on the DBMS, numbers may have to be passed as a string before they can be padded.
DBMSs that have an RPAD() function include MySQL, MariaDB, PostgreSQL, and Oracle.
DBMSs that don’t have an RPAD() function include SQL Server and SQLite.
Format a Number as Currency in SQL
Some DBMSs have functions that allow us to format numbers as currency just by passing the appropriate format string. This converts the number to a string with the applicable currency symbol, group separator, and decimal point (if relevant).
Other DBMSs don’t make it that easy, and you need to do a bit of work first.
Below are examples of using SQL to format numbers as currency in some of the most popular DBMSs.
Continue readingSelect Everything Before or After a Certain Character in MariaDB
In MariaDB, you can use the SUBSTRING_INDEX() function to return everything before or after a certain character (or characters) in a string.
Concatenate a String and a Number in SQL
In most cases, concatenating a string and a number in SQL is no different to concatenating two strings.
Most DBMSs will concatenate the string and number as if they were both strings. This is because the number is usually converted to a string before the concatenation operation.
Continue reading4 Ways to Check if a Table Exists in MariaDB
Here are four ways to check whether or not a table exists in a MariaDB database.
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