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PostgreSQL – UPDATE Query .................................................................................................................. 82


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17.
PostgreSQL – UPDATE Query .................................................................................................................. 82
18.
PostgreSQL – DELETE Query .................................................................................................................... 84
19.
PostgreSQL – LIKE Clause ........................................................................................................................ 86
20.
PostgreSQL – LIMIT Clause ...................................................................................................................... 89
21.
PostgreSQL – ORDER BY Clause ............................................................................................................... 91
22.
PostgreSQL – GROUP BY ......................................................................................................................... 94
23.
PostgreSQL – WITH Clause ...................................................................................................................... 97
Recursive WITH ............................................................................................................................................. 97
24.
PostgreSQL – HAVING Clause ................................................................................................................ 101
25.
PostgreSQL – DISTINCT Keyword ........................................................................................................... 104
ADVANCED POSTGRESQL ........................................................................................................ 107
26.
PostgreSQL – CONSTRAINTS .................................................................................................................. 108
NOT NULL Constraint ................................................................................................................................... 108
UNIQUE Constraint ...................................................................................................................................... 109


PostgreSQL 
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PRIMARY KEY Constraint ............................................................................................................................. 109
FOREIGN KEY Constraint .............................................................................................................................. 110
CHECK Constraint ........................................................................................................................................ 111
EXCLUSION Constraint ................................................................................................................................. 111
Dropping Constraints ................................................................................................................................... 112

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