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Sql statements delete table
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Sql statements delete table


Date:25.12.2016, 02:34 Most times, this is not what we intend to do. To prevent this, it is a best practice in database management to always run the corresponding SELECT statement first to make sure the rows selected are the ones we intend to remove from the table. The SQL Modification Statements make changes to database data in tables and columns. There are 3 modification statements: INSERT Statement - add rows to tables UPDATE Statement - modify columns in table rows DELETE Statement - remove rows from tables. DELETE Examples DELETE FROM sp WHERE pno 'P1' Before After sno pno qty S1 P1 NULL S2 P1 200 S3 P1 1000 S3 P2 200 sno pno qty S3 P2 200 DELETE FROM p WHERE pno NOT IN (SELECT pno FROM sp) Before After pno descr color P1 Widget Blue P2 Widget Red P3 Dongle Green pno descr color P1. It has the following general format: VALUES ( value-1, value-2. ) value-1 and value-2 are Literal Values or Scalar Expressions involving literals. They can also specify NULL. The values list in the VALUES clause must match the explicit or implicit column list for INSERT in degree (number of items). The default column list contains all columns in table-1 in the order they were declared in CREATE TABLE, or CREATE VIEW. VALUES Clause The VALUES Clause in the INSERT Statement provides a set of values to place in the columns of a new row.
Sql statements delete table


Sql statements delete table Sql statements delete table


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