TY  - BOOK
AU  - C.J.Date
TI  - SQL and Relational Theory: How to Write Accurate SQL Code
SN  - 9788184046939
U1  - 005.7585S 
PY  - 2009///
CY  - Sebastopol, CA
PB  - SPD
KW  - SQL (Computer program language); SQL (Langage de programmation)
N1  - Reprint, 2009; index
N2  - SQL 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
ER  -