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22 Ιουν 2018 · SELECT CASE WHEN REGEXP_LIKE(entrydate, '^\d{4}-\d{2}-\d{2}( \d{2}\.\d{2}\.\d{2})$') THEN REGEXP_REPLACE(entrydate, '^(\d{4})-(\d{2}).*$', '\1\2') END AS yyyymm_date FROM table; (Note that you were also missing an END from your CASE statement.)
The SQL CASE Expression. 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.
The CASE expression has two formats: simple CASE and searched CASE. You can use the CASE expression in a clause or statement that allows a valid expression. For example, you can use the CASE expression in statements such as SELECT, DELETE, and UPDATE or in clauses such as SELECT, ORDER BY, and HAVING. Simple CASE expression. The following ...
30 Απρ 2019 · In SQL Server, the purpose of the CASE expression is to always return an expression. It’s not intended for control of flow, which is why we don’t call it a CASE statement. In this tip, I share some of the finer points on how to best use a CASE expression.
3 Σεπ 2024 · The CASE expression has two formats: The simple CASE expression compares an expression to a set of simple expressions to determine the result. The searched CASE expression evaluates a set of Boolean expressions to determine the result. Both formats support an optional ELSE argument.
11 Φεβ 2020 · In this article we look at different ways to use the SQL Server CASE statement to handle sorting, grouping and aggregates.
28 Ιουν 2023 · Understanding SQL Case Statements. SQL case statements are a versatile and powerful tool in the database programmer’s arsenal. They provide a method for performing conditional expressions within SQL queries and stored procedures.
