000			01142nam a22002057a 4500
005			20250209182148.0
008			250209b |||||||| |||| 00| 0 eng d
020			_a9788184046939 _qpbk
041			_aeng
082			_a005.7585S _bDAT
100			_aC.J.Date
245			_aSQL and Relational Theory _bHow to Write Accurate SQL Code
260			_aSebastopol, CA _bSPD _cc2009
300			_axix, 404 p. _bill. _c23 cm.
500			_aReprint, 2009
504			_aindex
520			_aSQL is full of difficulties and traps for the unwary. You can avoid them if you understand relational theory, but only if you know how to put the theory into practice. In this insightful book, author C.J. Date explains relational theory in depth, and demonstrates through numerous examples and exercises how you can apply it directly to your use of SQL. This second edition includes new material on recursive queries, "missing information" without nulls, new update operators, and topics such as aggregate operators, grouping and ungrouping, and view updating.
650			_aSQL (Computer program language); SQL (Langage de programmation)
942			_cENGLISH
999			_c568428 _d568428