SQL data types

Types used in SQL databases.

Character strings

 * CHARACTER
 * VARCHAR
 * NCHAR
 * NVARCHAR

Sequences of bits

 * BIT
 * BIT VARYING

Numeric

 * INTEGER
 * SMALLINT
 * BIGINT
 * FLOAT
 * REAL
 * DOUBLE PRECISION
 * NUMERIC

Time

 * DATE
 * TIME
 * TIMESTAMP
 * TIMETZ
 * TIMESTAMPTZ

Null
There is a special value NULL, which means the lack of any value in the column.