SQL ─ Group By ....................................................................................................................................... 82
23.
SQL ─ Distinct Keyword ........................................................................................................................... 86
24.
SQL ─ SORTING Results ........................................................................................................................... 89
25.
SQL ─ Constraints .................................................................................................................................... 92
SQL - NOT NULL Constraint ........................................................................................................................... 92
SQL - DEFAULT Constraint ............................................................................................................................. 93
SQL - UNIQUE Constraint ............................................................................................................................... 94
SQL ─ Primary Key.......................................................................................................................................... 95
SQL ─ Foreign Key .......................................................................................................................................... 96
SQL ─ CHECK Constraint ................................................................................................................................ 98
SQL ─ INDEX Constraint ................................................................................................................................. 99
Dropping Constraints ................................................................................................................................... 101
Integrity Constraints .................................................................................................................................... 101
26.
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