Essence of SQL: a guide to learning the most SQL in the least amount of time 0964981211, 9780964981218
-- Excellent resource for corporate training and as a university text. -- Author is a nationally recognized, widely publ
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English Pages 117 [136] Year 1998
Table of contents :
Cover......Page 1
Title......Page 3
Copyright......Page 4
Contents......Page 5
List of Figures......Page 7
1 Introduction......Page 11
2 Example Database......Page 13
3 A Bird's Eye View of SQL......Page 15
4 The Standard Questions......Page 19
5 The First Two Questions......Page 21
6 Standard Questions Involving "or'' and "both-and"......Page 27
7 Negation in SQL......Page 33
8 Standard Questions Involving "at least"......Page 37
9 Negation Revisited......Page 39
10 Type 2 SQL Queries......Page 41
11 Using Type 2 to Implement Real Negation......Page 45
12 Posing Questions Involving "at most," "exactly," "only," and "either-or"......Page 47
13 Computing Extremes as Type 2 Queries with Negation......Page 53
14 A Look at SQL Enhancements......Page 55
15 Handling Composite Keys......Page 63
16 Negation Over Composite Keys......Page 65
17 Standard Questions Involving "every"......Page 69
18 A Brief Interlude......Page 71
19 Additional Standard Questions......Page 73
20 Computing Aggregates for Groups......Page 75
21 Combining Scalar Expressions with Aggregation......Page 83
22 Some Old Questions Revisited......Page 85
23 Global Aggregations......Page 87
24 Comparing Base Values to Aggregates......Page 89
25 Combining Type 2 Queries with Aggregation......Page 93
26 The Overall Order of Evaluation......Page 97
27 NULL Values in SQL......Page 101
28 Introduction to Type 3 SQL Queries......Page 107
29 Inter-Query Connectors Revisited: Existential Quantifiers in SQL......Page 111
30 Some Old Questions Revisited—Again......Page 113
31 Data Manipulation Facilities of SQL......Page 119
32 Extensions to SQL......Page 125
33 Last Remarks......Page 127
Acknowledgments......Page 129
Notes......Page 130
Back Cover......Page 136
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