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DELETE Statement Syntax
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The DELETE statement full syntax is as follows:
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[ WITH <common_table_expression> [ ,...n ] ] DELETE [ TOP ( expression ) [ PERCENT ] ] [ FROM ] { <object> | rowset_function_limited [ WITH ( <table_hint_limited> [ ...n ] ) ] } [ <OUTPUT Clause> ] [ FROM <table_source> [ ,...n ] ] [ WHERE { <search_condition> | { [ CURRENT OF { { [ GLOBAL ] cursor_name } | cursor_variable_name }
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Modifying Data The INSERT, UPDATE, DELETE, and MERGE Statements
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] } } ] [ OPTION ( <Query Hint> [ ,...n ] ) ] [; ]
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<object> ::= { [ server_name.database_name.schema_name. | database_name. [ schema_name ] . | schema_name. ] table_or_view_name }
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note
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The CURRENT OF, GLOBAL, cursor_name, and cursor_variable_name options are applicable only when using cursors. The discussion of cursors is beyond the scope of this book. For more information about cursors, see the article Transact-SQL Cursors in SQL Server Books Online.
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The syntax for the DELETE statement is the simplest of the three DML statements. Like the UPDATE statement, it is important to remember to include the WHERE clause when writing a DELETE statement. If you execute a DELETE statement without a WHERE clause, all rows from the table are deleted. To delete all rows from a table, the syntax is simply
DELETE FROM <tablename>
note
OPtiOnaL FROM keYWORD
The FROM keyword is optional in the DELETE statement syntax.
To limit the rows removed, add a WHERE clause to the DELETE statement. The following example removes all rows in the Employees table for the employee who has an employee ID of 7:
DELETE FROM EMPLOYEES WHERE EmployeeID = 7
note
DatabaSe
This sample uses the Northwind database, but it does not actually succeed in the sample database due to a foreign key constraint with the Orders table.
Lesson 1: Modifying Data by Using INSERT, UPDATE, and DELETE Statements
Like the INSERT and UPDATE commands, the DELETE command can remove rows in one table based on information returned from a joined table. To accomplish this, you define a second FROM clause. The following command removes rows from the Order Details table where the order was placed before July 10, 1996, and the order has shipped:
DELETE FROM [Order Details] FROM ORDERS JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID WHERE OrderDate < '07-10-1996' AND ShippedDate IS NOT NULL
Using the TRUNCATE TABLE Statement
Like a DELETE statement without a WHERE clause, the TRUNCATE TABLE statement can also be used to remove all data from a table. The TRUNCATE TABLE statement differs from the DELETE statement in several ways. First, the DELETE statement logs information on each row deleted, while the TRUNCATE TABLE statement only creates entries for the deallocation of the data pages. Second, because of the minimal logging, along with how the Database Engine removes the data from the table, the TRUNCATE TABLE statement executes more quickly and requires fewer resources on the server. Finally, if an identity column exists in the table, the TRUNCATE TABLE command resets the identity seed value. The syntax for the TRUNCATE TABLE statement is simply
TRUNCATE TABLE <tablename>
Neither the DELETE statement without a WHERE clause nor the TRUNCATE TABLE statement affect the schema structure of the table or related objects. Pr actice
Modifying Data
In this practice, you insert data into the Credit table in the Sales database by using a variety of methods. You also update and delete data from the Credit table.
e xercise 1
Insert Data
In this exercise, you insert data into the Credit table and verify the results.
1. 2.
If necessary, start SSMS and connect to your SQL Server instance. Open, review, and execute the Lesson01 PracticeSetup.sql file, which can be found among the accompanying sample files in the Practice folder, to create the Sales database and the Credit table for these exercises. Close the current query window. Open a new query window, and type and execute the following command to review the columns in the Sales table. No rows exist in this table at this time:
USE Sales; GO SELECT * FROM Credit;
3. 4.
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