Case sql query

The SQL CASE 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. For a list of control-of-flow methods, see Control-of-Flow Language (Transact- SQL ). In the following example, we want to get Product name for ProductID 4. Because of this pairing, you might be tempted to call this SQL CASE WHEN, but CASE is the accepted term. Use of CASE Expressions in SQL query is sometimes extremely useful.

Depending upon Tutorial_Name Value, Tutorial_Name column will get the update with THEN Statement value. What it does is evaluates a list of conditions and returns one of the multiple possible result expressions. If there is no ELSE part and no conditions are true, it returns NULL. Can you guys show me an example of CASE where the cases are the conditions and the are from the cases. OR is not supported with CASE Statement in SQL.

SELECT query with CASE condition and SUM(). What does case statement mean in SQL? How to use case in SQL? As the data for columns can vary from row to row, using a CASE SQL expression can help make your data more readable and useful to the user or to the application.

CASE is used to provide if-then-else type of logic to SQL. CASE can be used in any statement or clause that allows a valid expression. Microsoft SQL Docs, CASE.

Syntax of CASE Expression. CASE expression is used for selecting or setting a new value from input values. Description of the illustration simple_ case_statement. If the ELSE clause is omitte the system. It allows you to select one sequence of statements to execute out of many possible sequences.

SQL CASE provides the author of the query with the ability to perform conditional logic in their SQL queries for SELECT, INSERT, UPDATE, DELETE. It is also possible to use it with SET, IN, HAVING, ORDER BY and WHERE. MS Access select case example 2. Case statement result. We used the “DiscountRate” column.

This most likely stems from their use in programming languages. CASE statement uses selector rather than a Boolean expression to choose the sequence. Because CASE is an expression, you can use it in any clause that accepts an expression such as SELECT, WHERE, GROUP BY, and HAVING. When I first started writing SQL queries I was using Postgresql, and used some of their custom regular expression capabilities to perform case -insensitive queries.

Oracle SQL allows you to add Boolean logic and branching using the decode and CASE clauses. CASE in Having, Order By and UPDATE statements. In this example, I will only two columns and will demonstrate to you how you can write a dynamic SQL like query based on if the condition has value or not.

This article is a continuation of SQL Server CASE Statement and CASE WHEN Examples.