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how to use if else in mysql

how to use if else condition in mysql

The MySQL IF statement permits you to execute an arrangement of SQL explanations in view of a specific condition or estimation of an expression. To shape an expression in MySQL, you can join literals, factors, administrators, and even capacities. An expression can return one of three values TRUE FALSE, or NULL.

MySQL IF statement syntax

MySQL IF ELSE statement

Example

suppose you have a two table chat_members and chat_rating .

how to use  if else in mysql

how to use  if else in mysql

You have a requirement that when you fetch all members from chat_members then it must print rating of that particuler user and the main condition is if there is no record of rating for any user then it must return 0 instead of NULL. For this we will use our IF condition as below

this will return 0 as r_avg if there is no record in chat_rating for a member

how to use  if else in mysql

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