Switch case postgre

PostgreSQL provides two forms of the CASE expressions. CASE clauses can be used wherever an expression is valid. If the result is true then the value of the CASE expression is the result that follows the condition.

Conditional expressions are one of the most fundamental elements of any programming paradigm. Common conditional expressions include if-else blocks and switch cases. Each condition is an expression that returns a boolean result.

I currently want to execute this query o. Updating a table using CASE and conditions. How to switch databases in psql? END with multiple conditions.

The searched CASE statement executes statements based on the result of Boolean expressions in each WHEN clause. Then the evaluation stops and the corresponding statement are executed. The control is passed to the next statement after END CASE. Result of CASE expression is used as index to array of statements paths. I am running a CASE statement on one of my tables and it consumes a huge amount of hard drive space that is never freed up even when i run VACUUM ANALYZE.

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Not to be confused with the CASE expression of SQL. And subtly different syntax rules, too. Ask Question Asked years, months ago.

The simple form of CASE provides conditional execution based on equality of operands. The search-expression is evaluated (once) and successively compared to each expression in the WHEN clauses. If a match is foun then the corresponding statements are execute and then control passes to the next statement after END CASE.

This is JUST a psql comman in Postgres itself, there is no way to switch. Once you are connected to a database, you can switch the connection to a new database under a user specified by user. The previous connection will be closed.

If you omit the user parameter, the current user is assumed. A switch statement allows a variable to be tested for equality against a list of values. Each value is called a case , and the variable being switched on is checked for each switch case.