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Database designers that use a surrogate key as the primary key for every table will run into the occasional scenario where they need to automatically retrieve the database-generated primary key from an SQL INSERT statement for use in other SQL statements. Most systems do not allow SQL INSERT statements to return row data. Therefore, it becomes ...
Additionally there is a single-row version, UPDATE OR INSERT INTO tablename (columns) VALUES (values) [MATCHING (columns)], but the latter does not give you the option to take different actions on insert versus update (e.g. setting a new sequence value only for new rows, not for existing ones.)
SQL includes operators and functions for calculating values on stored values. SQL allows the use of expressions in the select list to project data, as in the following example, which returns a list of books that cost more than 100.00 with an additional sales_tax column containing a sales tax figure calculated at 6% of the price.
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 ...
Tables can be set to inherit their characteristics from a parent table. Data in child tables will appear to exist in the parent tables, unless data is selected from the parent table using the ONLY keyword, i.e. SELECT * FROM ONLY parent_table;. Adding a column in the parent table will cause that column to appear in the child table.
Hannah Kobayashi, a Hawaiian woman who has been missing for weeks, walked freely into Mexico just after noon on Nov. 12, the Los Angeles Police Department said on Monday. The department said the ...
From October 2008 to December 2012, if you bought shares in companies when Douglas M. Steenland joined the board, and sold them when he left, you would have a 40.4 percent return on your investment, compared to a 53.3 percent return from the S&P 500.
I wore my purity ring, highlighted Bible verses about sexual purity in my Teen Bible, and kept my beloved dog-eared copy of “I Kissed Dating Goodbye” by Joshua Harris — a book that advocated ...