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IF(type = 'P', amount, amount * -1) as amount. See https://dev.mysql.com/doc/refman/8.0/en/flow-control-functions.html. Additionally, you could handle when the condition is null. In the case of a null amount: IF(type = 'P', IFNULL(amount,0), IFNULL(amount,0) * -1) as amount.
Definition and Usage. The IF () function returns a value if a condition is TRUE, or another value if a condition is FALSE. Syntax. IF (condition, value_if_true, value_if_false) Parameter Values. Technical Details. More Examples. Example. Return 5 if the condition is TRUE, or 10 if the condition is FALSE: SELECT IF(500<1000, 5, 10);
Use IF...THEN...ELSEIF...ELSE statement to evaluate multiple conditions sequentially and execute corresponding blocks of statements based on the first true condition, with an optional block of statements to execute if none of the conditions is true.
10 Μαρ 2024 · This tutorial explains the usage of MySQL IF and IF ELSE Statements in Select queries with syntax and practical programming examples: MySQL provides an IF () function which is a flow control function and depending on the condition specified and its evaluation to true or false, the rest of the statement executes.
21 Αυγ 2024 · MySQL IF-THEN-ELSE Statement: When the condition checks to be TRUE, the statements between IF-THEN and ELSE execute. On the other hand, the statements (else-statements) between the ELSE and END IF execute. Syntax: IF condition THEN. statements; ELSE. else-statements; END IF; Parameters Used:
22 Φεβ 2017 · In a procedure the use of an IF is pretty straight forward: IF (yourCondition [logical operator(OR, AND) another condition] ) THEN. So in a practical example: .... DECLARE m integer; DECLARE n integer; SET m = 1; SET n = 0; IF ((m>n AND m=1 AND n=0) OR m=n)THEN.
This tutorial shows how to use the IF / ELSE / END IF syntax followed by the alternative SELECT CASE syntax. For all but the simplest conditions the SELECT CASE format will give code which is easier to write, comment and understand. Let's start, then, with the simple IF condition!
