SQL Server IF ELSE Statement By Examples.
The SQL AND condition and OR condition can be combined to test for multiple conditions in a SELECT, INSERT, UPDATE, or DELETE statement. When combining these conditions, it is important to use parentheses so that the database knows what order to evaluate each condition. (Just like when you were learning the order of operations in Math class!) Subscribe. Syntax. The syntax for the AND condition.
If the condition is unknown or false, processing continues to the next search condition, until either a condition is true or processing reaches the ELSE clause. SQL-procedure-statement Specifies an SQL statement to be executed if the preceding search-condition is true. See SQL-procedure-statement.
Unless a statement block is used, the IF or ELSE condition may be imposed on only one Transact-SQL statement or the very next statement after the IF or ELSE. To define a statement block or to include multiple statements as part of your control-of-flow block, use the keywords BEGIN and END.
The second form of IF statement adds the keyword ELSE followed by an alternative sequence of statements. The sequence of statements in the ELSE clause is executed only if the Boolean expression returns FALSE or NULL. Thus, the ELSE clause ensures that a sequence of statements is executed. The third form of IF statement uses the keyword ELSIF to introduce additional Boolean expressions. If the.
The SQL Coalesce and IsNull functions are used to handle NULL values. During the expression evaluation process the NULL values are replaced with the user-defined value.
Using the IF-THEN-ELSE Statement. The second form of IF statement adds the keyword ELSE followed by an alternative sequence of statements, as shown in Example 4-2. The statements in the ELSE clause are executed only if the condition is FALSE or NULL.The IF-THEN-ELSE statement ensures that one or the other sequence of statements is executed. In the Example 4-2, the first UPDATE statement is.
JavaScript If Else IF Statement. JavaScript else if statement evaluates the if condition and execute a block of code if expression become true, otherwise check the next else if condition and so on. If specified if else condition not satisfied then execute the else block of code. Syntax.