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7 Αυγ 2013 · SELECT * FROM dbo.CompanyMaster A LEFT JOIN @Areas B ON A.AreaId=B.AreaID WHERE A.AreaId= (CASE WHEN EXISTS (SELECT BusinessId FROM dbo.AreaSubscription WHERE AreaSubscription.BusinessId = CompanyMaster.BusinessId) THEN @AreaId ELSE B.AreaId END) )
22 Νοε 2020 · The DATA_LENGTH and INDEX_LENGTH are the space your data and indexes are using, and DATA_FREE is the total amount of bytes unused in all the table pages (fragmentation). Here's an example of a real production table
In this tutorial, you will learn how to use the MySQL CASE expression to add if-else logic to SELECT, WHERE, and ORDER BY of a query.
29 Αυγ 2024 · I've seen the EXISTS keyword in Microsoft SQL Server T-SQL code and don't understand it well. What does it do? How do I use it? Are there best practices around SQL EXISTS? This SQL tutorial will explain what the keyword EXISTS does and show several different use cases.
The SQL CASE Expression. 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.
The CASE expression in SQL server allows us to apply if-then-else logic in a SQL statement. A CASE consists of a number of conditions with an accompanying custom result value in a case body followed by an optional ELSE clause.
Summary: in this tutorial, you will learn how to use MySQL CASE statements to construct complex conditional statements inside stored procedures. Besides the IF statement, MySQL provides an alternative conditional statement called the CASE statement used in stored procedures. The CASE statements make the code more readable and efficient.
