show primary key in sql

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Giulia
23 Sep 2019
1-- NOTE: this is for SQL-Oracle specifically
2
3-- syntax:
4SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner
5FROM all_constraints cons, all_cons_columns cols
6WHERE cols.table_name = '<table-name>' -- Replace <table-name> with your table-name
7AND cons.constraint_type = 'P'
8AND cons.constraint_name = cols.constraint_name
9AND cons.owner = cols.owner
10
11
12-- example:
13SELECT cols.table_name, cols.column_name, cols.position, cons.status, cons.owner
14FROM all_constraints cons, all_cons_columns cols
15WHERE cols.table_name = 'CUSTOMERS' 
16AND cons.constraint_type = 'P'
17AND cons.constraint_name = cols.constraint_name
18AND cons.owner = cols.owner
Emi
09 Feb 2016
1The PRIMARY KEY constraint uniquely identifies each record in a table.
2Primary keys must contain UNIQUE values, and cannot contain NULL values. 
3A table can have only ONE primary key; and in the table, this primary key can consist of single or multiple columns (fields).
4
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