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The COALESCE function in MySQL is used to return the first non-NULL value in a list of expressions. If all expressions are NULL, the function returns...
The EXISTS operator is a logical operator in MySQL used to test if a subquery returns any rows. The EXISTS operator returns a boolean value, either...
The GROUP BY clause in MySQL is used to group rows in a result set based on one or more columns. It is often used in conjunction with aggregate...
The UNION operator in MySQL is used to combine the results of two or more SELECT statements into a single result set. It is a useful tool for merging...
MySQL joins are used to combine data from multiple tables in a relational database. They allow you to retrieve information from multiple tables as if...
Aliases are used for our convenience to give the result columns a temporary name and make them more readable. Aliases are temporary, meaning they...
