Real Name	:	SharingCode.NET User
Subject	:	Unique constraint refers to a group of columns, the columns are listed separated by commas
Description	:	Unique constraint refers to a group of columns, the columns are listed separated by commas
postgres=# postgres=# postgres=# -- Unique constraint refers to a group of columns, the columns are listed separated by commas: postgres=# postgres=# CREATE TABLE example ( postgres(# a integer, postgres(# b integer, postgres(# c integer, postgres(# UNIQUE (a, c) postgres(# ); NOTICE: CREATE TABLE / UNIQUE will create implicit index "example_a_key" for table "example" CREATE TABLE postgres=# postgres=# drop table example; DROP TABLE postgres=#
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