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2 Ιουλ 2010 · Based on my condition, (for eg. length), I want to execute different SQL statement. Problematic sample query is as follows: select case. when char_length('19480821') = 8. then select count(1) from Patient. when char_length('19480821')=10. then select count(1) from Doctor. end.
The CASE expression provides conditional SQL expressions. You can use case expressions anywhere you can use an expression. The syntax of the CASE expression is as follows: CASE expression. WHEN expression THEN expression [, …] [ ELSE expression ] END. You cannot use a subquery as a value expression in a CASE statement.
Oracle CASE expression allows you to add if-else logic to SQL statements without having to call a procedure. The CASE expression evaluates a list of conditions and returns one of the multiple possible results. You can use a CASE expression in any statement or clause that accepts a valid expression.
7 Δεκ 2023 · How to use CASE for IF-THEN logic in SQL SELECT. If you want to see the grade for each exam, select the case expression like a regular column: It’s a good idea to give the expression an alias. This is particularly important if the case is in a subquery.
CASE expressions let you use IF... THEN... ELSE logic in SQL statements without having to invoke procedures. The syntax is:
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.
1 Μαρ 2024 · Yes, you can connect to SQL Server from a Mac using various SQL Server clients that are compatible with macOS, such as DbVisualizer. These clients provide the necessary tools to manage and interact with your SQL Server databases effectively.
