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DELETE Command - SQL
Loosely speaking, DELETE removes some existing rows from its target table. Suppose the university decides that course C3 is to be withdrawn. Example shows how.
Example: Withdrawing course C3, using DELETE
DELETE FROM COURSE WHERE CourseId = 'C3';
Every row that satisfies the given WHERE condition is deleted; rows that do not satisfy it remain in place.
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Using EXISTS The EXISTS(n) returns TRUE if the nth element in a collection exist. Or else, EXISTS(n) returns FALSE. Primarily, you use EXISTS with DELETE to maintain the spars
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