000			00508nam a2200193Ia 4500
999			_c51022 _d51022
005			20190909123516.0
008			180612s9999||||xx |||||||||||||| ||und||
020			_a81-7029-644-7
041			_aen
082			_a006.663
100			_aGRUBER, Martin _94933
245		0	_aUnderstanding SQL
260			_aNew Delhi _bBPB _c1995
300			_axxvi, 483p.
650			_aUsing The Exists Operator _94934
650			_aCorrelated Subqueries _94935
650			_aUsing the Union Clause _94936
942			_cPR _2ddc