Difference between case and decode oracle11/12/2023 Thus, the ELSE clause ensures that a sequence of statements is executed. The sequence of statements in the ELSE clause is executed only if the condition is false or null. The second form of IF statement adds the keyword ELSE followed by an alternative sequence of statements, as follows: You might want to place brief IF statements on a single line, as in UPDATE payroll SET pay = pay + bonus WHERE empno = emp_id In either case, control passes to the next statement. If the condition is false or null, the IF statement does nothing. The sequence of statements is executed only if the condition is true. The simplest form of IF statement associates a condition with a sequence of statements enclosed by the keywords THEN and END IF (not ENDIF), as follows: The CASE statement is a compact way to evaluate a single condition and choose between many alternative actions. There are three forms of IF statements: IF-THEN, IF-THEN-ELSE, and IF-THEN-ELSIF. That is, whether the sequence is executed or not depends on the value of a condition. In this tutorial, you have learned how to use the SQL DECODE() function to add the if-then-else logic to a query.The IF statement lets you execute a sequence of statements conditionally. In this case, the DECODE() function returned the salary column, therefore, the result set was sorted by salary column. The DECODE() function returned the column to sort based on the input argument. In this example, we used the DECODE() function in the ORDER BY clause. We will use the employees table in the sample database for demonstration.Įmployee_id, first_name, last_name, salary
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |