Can we use case in where clause?
CASE can be used in any statement or clause that allows a valid expression. For example, you can use CASE in statements like SELECT, UPDATE, DELETE, and SET, and in clauses like select_list, IN, WHERE, ORDER BY, and HAVING.
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How do multiple conditions occur in a SQL case?
Here are 3 different ways to apply a case statement using SQL:
- (1) For a single condition: CASE WHEN condition_1 THEN result_1 ELSE result_2 END AS new_field_name.
- (2) For multiple conditions using AND: CASE WHEN condition_1 AND condition_2 THEN result_1 ELSE result_2 END AS new_field_name.
What does Max (case when) do in SQL?
The Users table includes the id and username columns. The Users_meta table includes the user, meta, and value columns. The meta include “first name”, “last name” and “user level”. The actual code includes more MAX (CASE WHEN) lines, and the HAVING statement changes depending on the search query. What I don’t understand is what MAX is doing.
How does Max work in a where clause?
A maximum computes a single value from a set of rows. If you put a max, or any other aggregate function in a where clause, how can SQL server figure out which rows the max function can use until the where clause has finished filtering? This deals with the order in which SQL Server processes the commands.
How to write a case statement with multiple values in SQL?
SQL case statement with multiple values. So you should use simple case sensitive syntax if you want to get the result based on different values. The simple case syntax checks only the equality of case_value with value_1 to value_n.
How to USE CASE expression in Stack Overflow?
The subquery identifies all IDs that are “active” based on whether they are not closed or the end date is in the future; and then, if such a record exists, we use a case to set all those IDs to active or closed. Thanks for contributing an answer to Stack Overflow!