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The ALL operator: returns a boolean value as a result. returns TRUE if ALL of the subquery values meet the condition. is used with SELECT, WHERE and HAVING statements. ALL means that the condition will be true only if the operation is true for all values in the range.
Our SQL tutorial will teach you how to use SQL in: MySQL, SQL Server, MS Access, Oracle, Sybase, Informix, Postgres, and other database systems. Start learning SQL now » Examples in Each Chapter
The EXISTS operator is used to test for the existence of any record in a subquery. The EXISTS operator returns TRUE if the subquery returns one or more records. EXISTS Syntax
MySQL Functions. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.
Click "Run SQL" to execute the SQL statement above. W3Schools has created an SQL database in your browser. The menu to the right displays the database, and will reflect any changes. Feel free to experiment with any SQL statement. You can restore the database at any time.
SQL Statement: SELECT ProductName FROM Products WHERE ProductID = ALL (SELECT ProductID FROM OrderDetails WHERE Quantity = 10); Edit the SQL Statement, and click "Run SQL" to see the result.
The MySQL LIMIT Clause. The LIMIT clause is used to specify the number of records to return. The LIMIT clause is useful on large tables with thousands of records. Returning a large number of records can impact performance.
A stored procedure is a prepared SQL code that you can save, so the code can be reused over and over again. So if you have an SQL query that you write over and over again, save it as a stored procedure, and then just call it to execute it.
SQL Editor. With our online SQL editor, you can edit SQL statements, and view the result in your browser.
Join Products and Categories with the INNER JOIN keyword: Note: The INNER JOIN keyword returns only rows with a match in both tables. Which means that if you have a product with no CategoryID, or with a CategoryID that is not present in the Categories table, that record would not be returned in the result.
