Primary keys constrains more than one column : Primary Key « Constraints « PostgreSQL

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PostgreSQL » Constraints » Primary Key   Primary keys constrains more than one column postgres=# postgres=# -- Primary keys constrains more than one column postgres=# postgres=# CREATE TABLE example ( postgres(#    a integer, postgres(#    b integer, postgres(#    c integer, postgres(#    PRIMARY KEY (a, c) postgres(# ); NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "example_pkey" for table "example" CREATE TABLE postgres=# postgres=# drop table example; DROP TABLE postgres=# postgres=#                     Related examples in the same category 1.  Implicit index is created when creating a table for a primary key 2.  Indicate one column as the primary key column 3.  PRIMARY KEY will create implicit index 4.  Primary key with check option 5.  Add PRIMARY KEY in table creation 6.  Use sequence value as a primary key

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