identify primary key in sql table

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Corentin
07 Apr 2018
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
Raylan
25 Apr 2020
1A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values.
2
3A table can have only one primary key, which may consist of single or multiple fields. When multiple fields are used as a primary key, they are called a composite key.
4
5If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).
Fátima
23 Jan 2018
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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