Sql switch case

How to switch a case? SQL Server allows for only levels of nesting in CASE expressions. The CASE expression cannot be used to control the flow of execution of Transact-SQL statements , statement blocks, user-defined functions, and stored procedures.

For a list of control-of-flow methods, see Control-of-Flow Language ( Transact-SQL ). So, once a condition is true, it will stop reading and return the result.

Switch like logic in T-SQL - Stack. It resolves to either TRUE, FALSE or NULL. Unlike IF…ELSE, where only the maximum of one condition is allowe CASE allows the user to apply multiple conditions to perform different sets of actions in MS SQL. In MS SQL , there are two types of CASE. Definition and Usage.

If no conditions are true, it will return the value in the ELSE clause. If there is no ELSE part and no conditions are true, it returns.

Can you guys show me an example of CASE where the cases are the conditions and the are from the cases. An expression must be of type int, short, byte or char. A case value should be a constant literal value and cannot be duplicated. Expression value is compared with each case value.

It can be used in Insert statement as well. Followed by the selector is any number of the WHEN clauses. If the selector value is equal to expression in the WHEN clause, the corresponding sequence of statement after the THEN keyword is executed. A selector is an expression, the value of which is used to select one of several alternatives. The default case can appear in any order in the switch statement.

Control statements form the heart of most languages since they control the execution of other sets of statements. These are found in SQL too, and should be exploited for uses such as query filtering and query optimization through careful selection of tuples that match our requirement. CASE is the special scalar expression or conditional statement in the SQL language which returns a single value based on the evaluation of a statement. SQL Server: CASE Statement.

Once the result of the expression equal to a value in a WHEN clause, the CASE returns the corresponding result in the THEN clause. If CASE does not find any matches, it returns the result_n in the ELSE part, or NULL value if the ELSE part is IS not available. CASE statement uses selector rather than a Boolean expression to choose the sequence.

Pattern matching with the switch statement. Each case statement defines a pattern that, if it matches the match expression, causes its containing switch section to be executed. Let's try to use a searched case statement in which we will use.

In the above script, we are using the CASE expression in an. Select statement with searched Case. If the ELSE clause is omitte the system substitutes a default action.

If multiple cases matches a case value, the first case is selected. If no matching cases are foun the program continues to the default label. If no default label is foun the program continues to the statement(s) after the switch.