Db2 sql update case statement

We can make the use of case statement to induce if-else or conditional behavior in our query statements. There are two type of case statements which are simple case statement and searched case statement.

In a simple case statement, we have to find out the matching expression value for all the specified when clauses and then for the matching WHEN clause the THEN clause is given as output else it goes for giving out the expression value mentioned in ELSE if specified else it gives NULL value.

In case of searched case statement, we have to specify the expressions after WHEN clause such that they will evaluate to a Boolean value. The expression whose value gives true is considered for the final output else it goes for giving expression after ELSE clause if specified else NULL value.

This is a guide to DB2 case statement. Here we discuss the Introduction, syntax, examples with code implementation. You may also have a look at the following articles to learn more —. Submit Next Question. By signing up, you agree to our Terms of Use and Privacy Policy. Forgot Password? This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy.

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Govind Govind 2 2 gold badges 3 3 silver badges 13 13 bronze badges. It should be always TRUE. Add a comment. Active Oldest Votes. Improve this answer. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Inner compound statements can see variables that have been declared in outer compound statements. Scoping is illustrated in Figure 3.

In the above, 1 and 8 define the outer compound statement, while 2 and 5 define the inner compound statement. All statements, except statement 7 , will succeed. Statement 7 fails because an outer compound statement cannot see a variable declared within an inner compound statement. Scoping can be especially useful in the case of looping and exception handling, allowing the program flow to jump from one compound statement to another.

If an unhandled error that is, no condition handler has been declared for the SQLSTATE raised occurs within the compound statement, any work which is completed before the error will not be rolled back, but will not be committed either. The optional label is used to define a name for the code block. The label can be used to qualify SQL variables declared within the compound statement. If the ending label is used, it must be the same as the beginning label.

We will learn more about labels later in this chapter. The SQL procedure illustrated in Figure 3. Additionally, since this error is unhandled, the procedure will exit right after the error. It has not been committed or rolled back, however. The example in Figure 3. I would like to receive exclusive offers and hear about products from InformIT and its family of brands.

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