RAISE NOTICE 'first_val is greater than second_val' Statements //gets executed only if all the provided conditions retrieve false.Įxample #1: How to Use IF-THEN-ELSIF Statement in Postgres? Let’s create two variables and assign them some random values: DO $$ Statements //gets executed only if condition_n retrieves true. Statements //gets executed only if condition_2 retrieves true. Statements //gets executed only if condition_1 retrieves true. The below snippet elaborates the syntax of the IF-THEN-ELSIF statement: IF condition_1 THEN If none of the specified conditions retrieve a true value, then the statements associated with the else part will get executed.When a condition becomes true, all the statements associated with that condition will get executed, and the rest of the conditions will be skipped. The IF THEN ELSIF statement checks/evaluates each condition one by one.IF-THEN-ELSIF is one of the decision-driven statements that evaluate several conditions. How Does the ELSE IF Statement Work in PostgreSQL? This write-up will discuss the working of the IF-THEN-ELSIF statement through practical examples. In Postgres, the IF and IF-THEN-ELSE statements evaluate only one condition however, the IF-THEN-ELSIF statement evaluates several conditions. All these decision-driven statements are used to control the flow of the SQL statements based on specific criteria. PostgreSQL offers several decision-making statements such as IF, IF-THEN-ELSE, IF-THEN-ELSIF, etc.
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