It stands for “Data Definition Language” (DDL) can be used to produce and eliminate sources and database objects. Database managers will mainly us these instructions throughout the elimination and setup stages of the database project. Let us have a look in usage and the framework of four basic DDL commands.
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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.