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PostgreSQL tutorial. Error messages help: cause and solution.

Column must appear in the GROUP BY clause
Column specified more than once
Constraint for relation already exists
Constraint of relation does not exist
Control reaches end of function without return
ERROR: cannot begin/end transactions in PL/pgSQL
Duplicate key value violates unique constraint
Duplicate key value violates NOT NULL unique constraint
INSERT has more target columns than expressions
Invalid input syntax for type boolean
Multiple primary keys for table are not allowed
Negative substring length not allowed
Null value in column violates not-null constraint
PostgreSQL Numeric field overflow
Relation does not exist
Value too long for type character varying or type numeric

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