It is pretty easy to view the execution plan for any query. In the first example, the value in the SalariedFlag column of the HumanResources.Employee table is evaluated. Returns the result_expression of the first input_expression = when_expression that evaluates to TRUE. For more information, see Data Type Precedence (Transact-SQL). It’s good for displaying a value in the SELECT query based on logic that you have defined. Decode statement can be used with only SQL DML statements like SELECT, INSERT, UPDATE, DELETE. SQL Server allows for only 10 levels of nesting in CASE expressions. else_result_expression is any valid expression. input_expression is any valid expression. Employees that have the SalariedFlag set to 0 are returned in order by the BusinessEntityID in ascending order. If SQL Server can determine that omission of these tables from the query … The following example uses the CASE expression in a SET statement in the table-valued function dbo.GetContactInfo. According to MS SQL Docs, a CASE statement can be used throughout the SELECT statement. So, once a condition is true, it will stop reading and return the result. Below is a selection from the "OrderDetails" table in the Northwind sample database: The following SQL goes through conditions and returns a value when the first condition is met: The following SQL will order the customers by City. The Oracle CASE statements can do all that DECODE does plus lot of other things including IF-THEN analysis, use of any comparison operator and checking multiple conditions, all in a SQL query itself. SELECT (Transact-SQL) In this way, you can specify multiple conditions and multiple statements. SQL WHERE Clause ‘Equal’ or ‘LIKE’Condition. An example could be the following setup. THEN result_expression We cannot control the execution flow of stored procedures, functions using a Case statement in SQL We can have multiple conditions in a Case statement; however, it works in a sequential model. SELECT player_name, weight, CASE WHEN weight > 250 THEN 'over 250' WHEN weight > 200 THEN '201-250' WHEN weight > 175 THEN '176-200' ELSE '175 or under' END AS weight_group FROM benn.college_football_players See the example below. Needs Answer Microsoft SQL Server. input_expression is any valid expression.WHEN when_expressionIs a simple expression to which input_expression is compared when the simple CASE format is used. If no conditions are true, it will return the value in the ELSE clause. Use two case statements in one select statement: 1.23.17. Case statements are useful when you're dealing with multiple IF statements in your select clause. In the order specified, evaluates input_expression = when_expression for each WHEN clause. This SQL tutorial explains how to use the AND condition and the OR condition together in a single query with syntax and examples. SELECT CASE testStatus WHEN 'A' THEN 'Authorized' WHEN 'C' THEN 'Completed' WHEN 'P' THEN 'In Progress' WHEN 'X' THEN 'Cancelled' END AS Status, CASE testStatus WHEN 'A' THEN authTime WHEN 'C' THEN cmplTime … In the AdventureWorks2012 database, all data related to people is stored in the Person.Person table. SELECT CASE testStatus WHEN 'A' THEN 'Authorized' WHEN 'C' THEN 'Completed' WHEN 'P' THEN 'In Progress' WHEN 'X' THEN 'Cancelled' END AS Status, CASE testStatus WHEN 'A' THEN authTime WHEN 'C' THEN cmplTime … Introduction to SQL CASE Statement. Databases. Summary: In MS SQL, there are two types of CASE: Simple CASE and Searched CASE ; ELSE is optional in the CASE statement. To include multiple statements in a SQL query: Set the DSQEC_RUN_MQ global variable to 1: SET GLOBAL (DSQEC_RUN_MQ=1. result expression is any valid expression. Rather than putting the data in a case statement where you might have to repeat that case statement in more than one query, you could create a table with static data, then joint to that table. When subtracting 10 hours from VacationHours results in a negative value, VacationHours is increased by 40 hours; otherwise, VacationHours is increased by 20 hours. The CASE statement is SQL’s way of handling if/then logic. Examples might be simplified to improve reading and learning. Is the expression evaluated when the simple CASE format is used. The CASE statement allows you to perform an IF-THEN-ELSE check within an SQL statement. The following example uses the CASE expression to change the display of product line categories to make them more understandable. So, once a condition is true, it will stop select Name, Age, CASE WHEN Age >= 60 THEN 'senior discount' ELSE 'no discount' END AS discount from TestDB.dbo.People Run the query in SQL Server, and you’ll get the following result: Additional Examples of Case Statements when_expression is any valid expression. In reality, the DBMS query optimizer takes the SQL statement, analyzes it, and then decides on a how to run it. Suppose we want … For instance, let’s see how we can reference the “AdventureWorks2012” database and show an example of a SQL Case statement. 2. If these expressions are equivalent, the expression in the THEN clause will be returned. The simple CASE expression compares an expression to a set of simple expressions to determine the result. Viewed 70k times 7. In SQL Server, when you use the SELECT statement to query data from the table, the order of rows or columns in the result set is not guaranteed. Huge difference! The semicolon (;) is not the part of a query. So, once a condition is true, it will stop reading and return the result. met (like an IF-THEN-ELSE statement). DECLARE @COURSE_NAME VARCHAR (10) SELECT … The CASE statement goes through conditions and returns a value when the first condition is met (like an IF-THEN-ELSE statement). Within a SELECT statement, the CASE expression allows for values to be replaced in the result set based on comparison values. A SELECT statement that uses a searchable CASE function: 1.23.12. Both formats support an optional ELSE argument. The next disaster is that you have no concept of declarative programming Why are you casting things to NVARCHAR(50) and worse? If the ELSE clause is omitted, the system substitutes a default action. Active 4 years, 5 months ago. The first takes a variable called case_value and matches it with some statement_list. If there is no ELSE part and no conditions are true, it returns NULL. Case statements are useful when you're dealing with multiple IF statements in your select clause. Using the CASE WHEN (with no expression between CASE and WHEN) syntax for a CASE expression, the pattern is: CASE WHEN THEN [ELSE ] END. The SELECT statement is one of the most complex commands in SQL, therefore, in this tutorial, we’ll focus on the basics only. The SELECT statement is used to select data from a database. As in another IF…ELSE statement Server can return a result set with an unspecified order of rows or columns in! Means that SQL Server ( all supported versions ) Azure SQL database Azure SQL database Azure Managed..., Lname, country from [ EmployeeSource ] ) ELSE multiple case statement in sql select query not found.! With the first input_expression = when_expression that evaluates to true ’ or ‘ like ’ condition is ’... Control-Of-Flow Language ( Transact-SQL ) any query first Boolean_expression that evaluates to true, it will return the result evaluating... 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