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3 cze 2022 · You could do this: update table set. columnx = (case when condition then 25 else columnx end), columny = (case when condition then columny else 25 end) This is semantically the same, but just bear in mind that both columns will always be updated.
CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as <select_list>, IN, WHERE, ORDER BY, and HAVING. Transact-SQL syntax conventions.
6 cze 2017 · Using CASE with UPDATE. The CASE expression can also be used in an UPDATE statement. You are familiar with the UPDATE statement; it changes or updates existing column values. If you want to update records based on column values, you can do it with the CASE expression. Look at the following example:
20 kwi 2021 · CASE is used within a SQL statement, such as SELECT or UPDATE. Don’t mistake CASE for the IF ELSE control of flow construct, which is used to evaluate the conditional execution of SQL statements.
The CASE expression is used to compare one expression with a set of expressions in SQL. The result of the CASE expression is a Boolean value, true or false. We can use various DML statements like INSERT, SELECT, DELETE and UPDATE with a CASE statement.
1 kwi 2019 · The case statement in SQL returns a value on a specified condition. We can use a Case statement in select queries along with Where, Order By, and Group By clause. It can be used in the Insert statement as well.
The CASE expression goes through conditions and returns a value when the first condition is met (like an if-then-else statement). So, once a condition is true, it will stop reading and return the result. If no conditions are true, it returns the value in the ELSE clause.
