The Transact-SQL statement that follows an IF keyword and its condition is executed if the condition is satisfied: the Boolean expression returns TRUE. In this tutorial, you have learned how to use the SQL DECODE() function to add the if-then-else logic to a query. C if-else Statements - If else statements in C is also used to control the program flow based on some condition, only the difference is: it's used to execute some statement code block if the expression is evaluated to true, otherwise executes else statement code block. Nested subqueries : Subqueries are placed within another subquery. I want to use an if statement inside trigger but the value if comparison will come from an other select statement. ; Second, specify the code that will execute if the condition evaluates to TRUE. Note that the conditionals, and other statements, are written in all caps, in SQL. Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Parallel Data Warehouse Imposes conditions on the execution of a Transact-SQL statement. In this article. Active 1 year, 9 months ago. If it evaluates to true, the statement associated with THEN is executed. I have done the following: create or replace Trigger MYTRIGGER After Insert On Table1 Referencing Old As "OLD" New As "NEW" For Each Row Begin Declare Counter Int; Select Count(*) From Table2 Where Table2. The IF statement allows you to either execute or skip a sequence of statements, depending on a condition. https://www.sqlshack.com/sql-if-statement-introduction-and-overview So if there is a Source table and a Target table that are to be merged, then with the help of MERGE statement, all the three operations (INSERT, UPDATE, DELETE) can be performed at once.. A simple example will clarify … In the next session, we have thoroughly discussed the above topics. Summary: in this tutorial, you will learn how to use the PL/SQL IF statement to either execute or skip a sequence of statements based on a specified condition.. Otherwise, program control goes to the next statement of the program. Correlated subqueries : Reference one or more columns in the outer SQL statement. The IF statement has the three forms: – IF THEN – IF THEN ELSE – IF THEN ELSIF PL/SQL IF THEN statement In SQL Server, the IF...ELSE statement is used to execute code when a condition is TRUE, or execute different code if the condition evaluates to FALSE. Take a look at the following example. This SQL Server tutorial explains how to use the IF...ELSE statement in SQL Server (Transact-SQL) with syntax and examples. Ask Question Asked 9 years, 9 months ago. In this example, we used the DECODE() function in the ORDER BY clause. The subquery is known as a correlated subquery because the subquery is related to the outer SQL statement. Code language: SQL (Structured Query Language) (sql) In this syntax: First, specify a condition to execute the code between the IF-THEN and END IF.If the condition evaluates to TRUE, the statements between IF-THEN and END IF will execute. With the IF statement, we first check a condition. using if statement in sql function. The DECODE() function returned the column to sort based on the input argument. In this case, the DECODE() function returned the salary column, therefore, the result set was sorted by salary column.. Prerequisite – MERGE Statement As MERGE statement in SQL, as discussed before in the previous post, is the combination of three INSERT, DELETE and UPDATE statements. Otherwise, the control is passed to the next statement following the END IF. Add the if-then-else logic to a query goes to the outer SQL statement allows you to either execute or a! To the next statement following the END if is related to the SQL! 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