Sql

1.Uniquely identifies a single row in the table.
2.Multiple values allowed per table.
3.Null values allowed.

Unique Key:
Only unique value and also can contain NULL

PREVIOUS	NEXT

Code Example
Sql :: How to find string in substring in sql server
Sql :: insert or ignore postgres
Sql :: Expression number 1 of select list is not in group by clause
Sql :: raiserror with nowait
Sql :: restart mysql
Sql :: smallint sql
Sql :: remove last characters in mysql
Sql :: oracle error line
Sql :: mysql datetime format
Sql :: mysql dump for selected row
Sql :: Access PostgreSQL PSQl with sudo
Sql :: identity syntax in sql
Sql :: show tablespace oracle
Sql :: mysql remove database
Sql :: delete table in mysql
Sql :: mysql keyword search
Sql :: choose only one for each distinct collumn regardless of other columns
Sql :: restore backup "text" postgresql command line
Sql :: dublicate row sql
Sql :: concat all rows in sql postgres
Sql :: date in mysql
Sql :: sql distinct vs unique
Sql :: postgres select except
Sql :: select only unique values from and to current table
Sql :: having clause in sql
Sql :: spark apache sql coalesce
Sql :: find all tables where column name exists oracle
Sql :: sql delete duplicate rows but keep one
Sql :: sql server fn_dblog
Sql :: select all from table left join