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In SQL, the TRUNCATE TABLE statement is a data manipulation language (DML) [1] operation that deletes all rows of a table without causing a triggered action. The result of this operation quickly removes all data from a table , typically bypassing a number of integrity enforcing mechanisms.
A derived table is the use of referencing an SQL subquery in a FROM clause. Essentially, the derived table is a subquery that can be selected from or joined to. The derived table functionality allows the user to reference the subquery as a table. The derived table is sometimes referred to as an inline view or a subselect.
The CASE expression, for example, enables SQL to perform conditional branching within queries, providing a mechanism to return different values based on evaluated conditions. This logic can be particularly useful for data transformation during retrieval, especially in SELECT statements.
SQL was initially developed at IBM by Donald D. Chamberlin and Raymond F. Boyce after learning about the relational model from Edgar F. Codd [12] in the early 1970s. [13] This version, initially called SEQUEL (Structured English Query Language), was designed to manipulate and retrieve data stored in IBM's original quasirelational database management system, System R, which a group at IBM San ...
Deleting all rows from a table can be very time-consuming. Some DBMS [clarification needed] offer a TRUNCATE TABLE command that works a lot quicker, as it only alters metadata and typically does not spend time enforcing constraints or firing triggers. DELETE only deletes the rows. For deleting a table entirely the DROP command can be used.
Leaving money on the table is seemingly uncharacteristic for Epps, who raised eyebrows by pulling in roughly $204,000 in overtime last year for her administrative job in NYPD Chief of Department ...
From January 2008 to May 2012, if you bought shares in companies when R.R. Harkin joined the board, and sold them when she left, you would have a -36.3 percent return on your investment, compared to a -4.2 percent return from the S&P 500.
enhanced MERGE and DIAGNOSTIC statements, the TRUNCATE TABLE statement, comma-separated WHEN clauses in a CASE expression, INSTEAD OF database triggers, partitioned JOIN tables, support for various XQuery regular expression/pattern-matching features, and; enhancements to derived column names. [1]