barcode maker vb.net DELETE FROM ORDERS WHERE CUST = 2126 2 rows deleted. in Software

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DELETE FROM ORDERS WHERE CUST = 2126 2 rows deleted.
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In this case, the WHERE clause selects several rows of the ORDERS table, and SQL removes all of the selected rows from the table. Conceptually, SQL applies the WHERE clause to each row of the ORDERS table, deleting those where the search condition yields a TRUE result and retaining those where the search condition yields a FALSE or NULL result. Because this type of DELETE statement searches through a table for the rows to be deleted, it is sometimes called a searched DELETE statement. This term is used to contrast it with another form of the DELETE statement, called the positioned DELETE statement, which always deletes a single row. The positioned DELETE statement applies only to programmatic SQL and is described in 17.
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Here are some additional examples of searched DELETE statements: Delete all orders placed before November 15, 1989.
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DELETE FROM ORDERS WHERE ORDER_DATE < '15-NOV-89' 5 rows deleted.
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Delete all rows for customers served by Bill Adams, Mary Jones, or Dan Roberts (employee numbers 105, 109, and 101).
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DELETE FROM CUSTOMERS WHERE CUST_REP IN (105, 109, 101) 7 rows deleted.
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Delete all salespeople hired before July 1988 who have not yet been assigned a quota.
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DELETE FROM SALESREPS WHERE HIRE_DATE < '01-JUL-88' AND QUOTA IS NULL 0 rows deleted.
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UPDATING DATA
Deleting All Rows
The WHERE clause in a DELETE statement is optional, but it is almost always present. If the WHERE clause is omitted from a DELETE statement, all rows of the target table are deleted, as in this example: Delete all orders.
DELETE FROM ORDERS 30 rows deleted.
Although this DELETE statement produces an empty table, it does not erase the ORDERS table from the database. The definition of the ORDERS table and its columns is still stored in the database. The table still exists, and new rows can still be inserted into the ORDERS table with the INSERT statement. To erase the definition of the table from the database, the DROP TABLE statement (described in 13) must be used.
SQL: The Complete Reference
Because of the potential damage from such a DELETE statement, be careful to always specify a search condition, and be sure that it actually selects the rows you want. When using interactive SQL, it s a good idea first to use the WHERE clause in a SELECT statement to display the selected rows. Make sure they are the ones you want to delete, and only then use the WHERE clause in a DELETE statement.
DELETE with Subquery *
DELETE statements with simple search conditions, such as those in the previous examples, select rows for deletion based solely on the contents of the rows themselves. Sometimes the selection of rows must be made based on data from other tables. For example, suppose you want to delete all orders taken by Sue Smith. Without knowing her employee number, you can t find the orders by consulting the ORDERS table alone. To find the orders, you could use a two-table query: Find the orders taken by Sue Smith.
SELECT FROM WHERE AND ORDER_NUM, AMOUNT ORDERS, SALESREPS REP = EMPL_NUM NAME = 'Sue Smith'
ORDER_NUM AMOUNT ---------- ----------112979 $15,000.00 113065 $2,130.00 112993 $1,896.00 113048 $3,750.00
But you can t use a join in a DELETE statement. The parallel DELETE statement is illegal:
DELETE FROM ORDERS, SALESREPS WHERE REP = EMPL_NUM AND NAME = 'Sue Smith' Error: More than one table specified in FROM clause
10:
Database Updates
The way to handle the request is with one of the subquery search conditions. Here is a valid form of the DELETE statement that handles the request: Delete the orders taken by Sue Smith.
DELETE FROM ORDERS WHERE REP = (SELECT EMPL_NUM FROM SALESREPS WHERE NAME = 'Sue Smith') 4 rows deleted.
The subquery finds the employee number for Sue Smith, and the WHERE clause then selects the orders with a matching value. As this example shows, subqueries can play an important role in the DELETE statement because they let you delete rows based on information in other tables. Here are two more examples of DELETE statements that use subquery search conditions: Delete customers served by salespeople whose sales are less than 80 percent of quota.
DELETE FROM CUSTOMERS WHERE CUST_REP IN (SELECT EMPL_NUM FROM SALESREPS WHERE SALES < (.8 * QUOTA)) 2 rows deleted. UPDATING DATA
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