Efficient way to handle multiple CASE statements in SELECT
More precisely SELECT case when A column1 1 then select value from B where B clientId 100 and A column1 B Id when A column1 2 then select value from C where C clientId 100 and A column1 C Id when A column1 3 then select value from D where D clientId 100 and A column1 D Id and so on uptil 30 more when conditions
CASE Transact SQL SQL Server Microsoft Learn, Syntax for Parallel Data Warehouse syntaxsql CASE WHEN when expression THEN result expression n ELSE else result expression END Note To view Transact SQL syntax for SQL Server 2014 12 x and earlier versions see Previous versions documentation Arguments input expression
SQL CASE with multiple WHEN conditions Josip Miskovic
You can use the SQL CASE WHEN statement for multiple conditions by chaining additional WHEN clauses separated by spaces or newlines Remember to end the statement with the ELSE clause to provide a default value Here s an example sql
Understanding the SQL Server CASE statement SQL Shack, The SQL Server CASE Statement consists of at least one pair of WHEN and THEN statements The WHEN statement specifies the condition to be tested The THEN statement specifies the action if the WHEN condition returns TRUE The ELSE statement is optional and executes when none of the WHEN conditions return true
Pragmatic Guide to SQL Server CASE Expression
Pragmatic Guide to SQL Server CASE Expression, Here is the output In this example First the condition in the WHERE clause includes sales order in 2018 Second the CASE expression returns either 1 or 0 based on the order status Third the SUM function adds up the number of order for each order status Fourth the COUNT function returns the total orders
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CASE Statement in SQL Examples SQL Server Tips
CASE Statement in SQL Examples SQL Server Tips The first format for the CASE expression has the following syntax CASE WHEN condition THEN expression if true ELSE expression if false END The ELSE argument is optional The example given in the introduction uses this format Let s take a look at some examples using the Employee table in the HumanResources schema
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SQL CASE Statement Syntax The syntax of the SQL CASE expression is CASE expression WHEN condition 1 THEN result 1 WHEN condition 2 THEN result 2 WHEN condition n THEN result n ELSE result END case name The CASE statement can be written in a few ways so let s take a look at these parameters SQL CASE Statement Explained with Examples Database Star. The case value matches the first value then next below values in proper order If case value is equal to Value 1 then next WHEN THEN statements will be skipped and CASE execution will be stopped immediately If case value is not equal to Value 1 then case value will match with value 2 for equality 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 If there is no ELSE part and no conditions are true it returns NULL
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