POSTGRES IF STATEMENT IN SELECT HOW TO

Through practical examples, this post explained the working of Postgres ELSE IF statement.SQL Server allows you to execute real-time programmatic logic on the values within your query. 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. It checks/evaluates each condition one by one. In Postgres, the ELSIF is one of the decision-driven statements that evaluate several conditions. Since the student having id 3 is a 19-year-old male, so, the ELSIF statement that satisfies the given condition retrieves a notice “Adult Male”. RAISE NOTICE 'Student with the specified id does not exist in the student_info table' IF student_data.std_age 18 AND student_data.std_gender= 'M' THENĮLSIF student_data.std_age 18 AND student_data.std_gender= 'F' THEN

If none of the above-given conditions return true, then show a notice 'student with the specified id doesn't exist in the student_info table'.

If std_age > 18 and std_gender = F then show “Adult Female”.If std_age 18 and std_gender = M then show “Adult Male”.

Now we will specify the following five scenarios in the control statements: We have created a table named student_info and inserted the following records into it: SELECT * FROM student_info

POSTGRES IF STATEMENT IN SELECT HOW TO

The output shows that the condition specified in the ELSIF part retrieves a true value, so the statement associated with the ELSIF part gets executed.Įxample #2: How to Use ELSIF Statement on Table’s Data? Else raise a notice “first_val is equal to the second_val”.In the if statement, we checked whether the first_val second_val then return “first_val is greater than second_val”.

Afterward, we utilized conditional statements to compare their values: In this example, we created two variables named first_val and second_val. RAISE NOTICE 'first_val is equal to second_val' 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.

Postgres if statement in select