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It was officially introduced in the SQL:2008 standard, as the optional feature F200, "TRUNCATE TABLE statement". TRUNCATE TABLE removes all rows from a table, but the table structure and its columns, constraints, indexes, and so on remain. To remove the table definition in addition to its data, use the DROP TABLE statement.
The DROP statement destroys an existing database, table, index, or view. A DROP statement in SQL removes a component from a relational database management system (RDBMS). The types of objects that can be dropped depends on which RDBMS is being used, but most support the dropping of tables , users , and databases .
A table is an arrangement of columns and rows that organizes and positions data or images. Tables can be created on Wikipedia pages using special wikitext syntax, and many different styles and tricks can be used to customise them.
Each column in an SQL table declares the type(s) that column may contain. ANSI SQL includes the following data types. [14] Character strings and national character strings. CHARACTER(n) (or CHAR(n)): fixed-width n-character string, padded with spaces as needed; CHARACTER VARYING(n) (or VARCHAR(n)): variable-width string with a maximum size of n ...
See Help:Sortable tables about rank columns and row numbers. See also: Commons:Convert tables and charts to wiki code or image files. See the section on updating List of countries by incarceration rate. Launch the visual editor. In the column you are copying click the header cell or whatever top cell you want.
1. Click the Settings icon | select More Settings. 2. Click Viewing email. 3. Under Inbox style, select Unified Inbox or use New/Old Mail. 4. Click Back to Inbox or Back to New Mail when done.
A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table every time said table is accessed.
1. Click the Contacts icon . 2. Click the Lists tab. 3. Select the list you want to edit from the drop-down menu. 4. Under "Add contacts" type the name or address of contacts you want to add, and select it from the suggestions to add it to the list.