[Latest*] what is sql server case statement (2022-23)?
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This SQL Server tutorial explains a way to use the SQL Server (Transact-SQL) CASE statement with syntax and examples.
In SQL Server (Transact-SQL), the CASE statement has the practicality of associate degree IF-THEN-ELSE statement. you'll use the CASE statement inside a SQL statement.
The CASE statement is employed to implement the logic wherever you would like to line the worth of 1 column relying upon the values in alternative columns.
The SQL Server CASE Statement consists of a minimum of one try of once and so statements. The once statement specifies the condition to be tested. The THEN statement specifies the action if the once condition returns TRUE.
The ELSE statement is nonobligatory and executes once none of the once conditions come back true. The CASE statement ends with associate degree finish keyword.
In this article, we are going to take a glance at variety of various samples of the CASE statement. however before we tend to do this, we’ll produce some dummy information to figure with.
The script higher than has created a dummy information referred to as saleroom with one Table in it referred to as Cars. The Cars table has seven columns: id, name, company, power, colour, model, and condition.
Now let’s insert some dummy information into the Cars table. Execute the subsequent script:
You can see that the condition column contains associate degree X in every row at the instant. we are going to set the worth of the condition column, looking on the model column, victimisation the CASE statement in order that you'll see clearly what's happening.
The CASE statement needs to be enclosed within the choose Statement. It starts with the CASE keyword followed by the once keyword and so the CONDITION.
The condition will be any valid SQL Server expression that returns a Boolean price. for example, the condition will be model > 2000, the THEN clause is employed once the CONDITION. If the CONDITION returns true the worth that follows the THEN clause is keep in column X. Else, the worth once the ELSE clause, also will be keep in column X. The SQL Server CASE statement ends with the tip clause.
Let’s currently see the CASE statement in action.
In a previous section, we tend to created a table named Cars within the saleroom information.
The condition column had the worth X for all rows. we are going to use the SQL Server CASE statement to line {the price|the worth} of the condition column to “New” if the model column contains a value larger than 2000, otherwise the worth for the condition column are set to “Old”.
Multiple conditions just in case statement
You can assess multiple conditions within the CASE statement.
Let’s write a SQL Server CASE statement that sets the worth of the condition column to “New” if the worth within the model column is larger than 2010, to ‘Average’ if the worth within the model column is larger than 2000, and to ‘Old’ if the worth within the model column is larger than 1990.
In the script higher than, we tend to assigned 3 completely different values to the condition column looking on the worth within the model column.
However, within the higher than script, the conditions area unit overlapping as. the model with {a price|a worth|a price} larger than 2010 additionally contains a value larger than 2000 and 1990. a stronger thanks to implement multiple conditions is to use logical operators like AND, OR, NOT, etc. verify the subsequent script:
Conclusion:-
The CASE statement comes in handy once you wish to implement IF-THEN logic in SQL Server. during this article, we tend to saw what CASE statement is in conjunction with its syntax. we tend to additionally saw completely different samples of CASE statement in conjunction with its usage with the cluster BY clause.Thank you.
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