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DELETE requires a shared table lock; Triggers fire; DELETE can be used in the case of: database link; DELETE returns the number of records deleted; Transaction log - DELETE needs to read records, check constraints, update block, update indexes, and generate redo / undo. All of this takes time, hence it takes time much longer than with TRUNCATE
For that reason, most programming language libraries contain a means of checking whether a file exists. An existence check can sometimes involve a "brute force" approach of checking all records for a given identifier, as in this Microsoft Excel Visual Basic for Applications code for detecting whether a worksheet exists:
These snippets of SQL code can address external data sources through the use of ODBC connections on the local machine. This enables users to interact with data stored outside the Access program without using linked tables or Jet. [44] Users construct the pass-through queries using the SQL syntax supported by the external data source.
WHERE clauses are not mandatory clauses of SQL DML statements, but can be used to limit the number of rows affected by a SQL DML statement or returned by a query. In brief SQL WHERE clause is used to extract only those results from a SQL statement, such as: SELECT, INSERT, UPDATE, or DELETE statement. [1]
Te-Hina Paopao scored 23 points, MiLaysia Fulwiley chipped in with 18 points off the bench and No. 1 South Carolina passed its first big test of the season with a 71-57 victory over ninth-ranked ...
"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Dementia impacts 6.7 million Americans, and the risk of developing the devastating disease increases ...
In the context of SQL, data definition or data description language (DDL) is a syntax for creating and modifying database objects such as tables, indices, and users. DDL statements are similar to a computer programming language for defining data structures, especially database schemas. Common examples of DDL statements include CREATE, ALTER ...
Whale watchers in northern California were treated with a sighting of a very pale orca nicknamed Frosty. A video taken by Evan Brodsky of the Monterrey Bay Whale Watch shows the white orca ...