How do I use a case statement in the where clause in SQL Server? (2024)

FAQs

Can I use case in WHERE clause in SQL Server? ›

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.

Here is the basic syntax of a Multiple CASE WHEN statement: SELECT column1, column2, CASE WHEN condition1 THEN result1 WHEN condition2 THEN result2 ... ELSE default_result END AS new_column FROM your_table; This construct proves invaluable in handling scenarios where more than one condition needs consideration.

SQL CASE Statement Explained

You use the CASE keyword together with the WHEN clause to execute a block of conditional statement code. You use a THEN statement to return the result of the expression. If none of the conditions are met, then you use a final ELSE clause to return a fallback result.

Conditional statements in the WHERE clause can be combined using logical operators, as illustrated below: SELECT * FROM customers WHERE country = 'UK' AND age >= 18; In this example, the query returns all records from the customers table where the country is 'UK', and the age is greater than or equal to 18.

It is possible to use CASE to filter data in the WHERE clause of a SQL query. This can be helpful if you want to restrict records based on logical conditions. Notice we don't alias the CASE statement when using it to filter since it doesn't return a column in the query.

The CASE statement always goes in the SELECT clause. CASE must include the following components: WHEN , THEN , and END . ELSE is an optional component. You can make any conditional statement using any conditional operator (like WHERE ) between WHEN and THEN .

A query can contain both a WHERE clause and a HAVING clause. In that case: The WHERE clause is applied first to the individual rows in the tables or table-valued objects in the Diagram pane. Only the rows that meet the conditions in the WHERE clause are grouped.

Answer. Yes, you can absolutely apply a WHERE clause in a query that also utilizes a HAVING statement.

IF is typically used within procedural code (stored procedures, functions, triggers) to conditionally execute blocks of code. CASE is used within queries to return different values based on conditions in SELECT, WHERE, and ORDER BY clauses.

The case statement should include your mission, vision and values statements, and should set out to clearly answer the who, what, and why of your fundraising efforts. Some questions that an effective case statement might seek to answer: - How does this organization help people?

How do you write two conditions in WHERE clause? ›

The AND operator is used when both conditions must be true, while the OR operator is used when either condition can be true. For example: `SELECT * FROM tablename WHERE condition1 AND condition2;` or `SELECT * FROM tablename WHERE condition1 OR condition2;`.

The variable may be used in subsequent queries wherever an expression is allowed, such as in a WHERE clause or in an INSERT statement.

It can't include a COMPUTE or FOR BROWSE clause, and may only include an ORDER BY clause when a TOP clause is also specified. A subquery can be nested inside the WHERE or HAVING clause of an outer SELECT , INSERT , UPDATE , or DELETE statement, or inside another subquery.

To write a case-sensitive search in SQL Server, don't use UPPER or LOWER functions around the column to filter. Instead, use the COLLATE keyword with a case-sensitive collation followed by the comparison.

The subsequent query performs a case-insensitive comparison in the ' WHERE ' clause. The ' CaseSensitiveExample ' table is created with a case-sensitive collation (' SQL_Latin1_General_CP1_CS_AS ') for the ' Name ' column. The subsequent query performs a case-sensitive comparison in the ' WHERE ' clause.

CASE is provided in SQL to allow Boolean evaluation where it is not normally allowed. The WHERE clause is specifically for making Boolean evaluations, so using CASE within the WHERE clause is usually a misstep.