Overview of SQL datataypes based on SQL 2003 (as it seems most extensive). "x" in column implies it exists also in other SQL versions, or is anticipated by ADQL. VOTable column gives likely mapping to VOTable data type. a "[(P[,S])]" after a datatypeps indicates that a precision (P) and possibly a scale(S) can be provided.

For info on database support this look at JVO presentation during Victoria 2006 interop. Also various JDBC mapping tables such as this.

In table stick to predefined data types. SQL 2003 and 99 also various user defined types such as ROW etc.

NB complete matching to other versions of SQL etc.

SQL 2003 Sort SQL 92 Sort SQL 99 Sort ADQL 2.0 Sort JDBC type4 Sort VOTable 1.2 (beta) Sort
CHARACTER [(P)] o o o CHAR  
CHAR [(P)] o o o CHAR  
CHARACTER VARYING[(P)] o o o VARCHAR  
CHAR VARYING [(P)] o o o VARCHAR  
VARCHAR [(P)] o o o VARCHAR  
CHARACTER LARGE OBJECT [(P)]1 x o x CLOB  
CHAR LARGE OBJECT [(P)]1 x o x CLOB  
CLOB [(P)]1 x o x CLOB  
NATIONAL CHARACTER [(P)] o o o NCHAR  
NATIONAL CHAR [(P)] o o o NCHAR  
NCHAR [(P)] o o o NCHAR  
NATIONAL CHARACTER VARYING[(P)] o o o NVARCHAR  
NATIONAL CHAR VARYING [(P)] o o o NVARCHAR  
NCHAR VARYING [(P)] o o o NVARCHAR  
NATIONAL CHARACTER LARGE OBJECT [(P)]1 x o x NCLOB  
NCHAR LARGE OBJECT [(P)]1 x o x NCLOB  
NCLOB [(P)]1 x o x NCLOB  
BINARY LARGE OBJECT [(P)]1 x o x BLOB  
BLOB [(P)]1 x o x BLOB  
NUMERIC [(P[,S])] o o o NUMERIC  
DECIMAL [(P[,S])] o o o DECIMAL  
DEC [(P[,S])] o o x DECIMAL  
INTEGER o o o INTEGER  
INT o o o INTEGER  
SMALLINT o o o SMALLINT  
BIGINT x x x BIGINT  
FLOAT [(P)] o o o FLOAT  
REAL o o o REAL  
DOUBLE PRECISION o o o DOUBLE  
BOOLEAN x o x BOOLEAN  
DATE o o o DATE  
TIME [(P)]2 o o o TIME  
TIMESTAMP [(P)]2 o o o TIMESTAMP  
INTERVAL ... 3 o o o x  
x BIT [(P)] o o BIT?  
x BIT VARYING [(P)] o o BIT?  

1 The syntax for sizes of large objects is actually somewhat different from the "[(P)]" applicable to simpler data types.
2 The syntax for sizes of TIME and TIMESTAMP is actually somewhat different from the "[(P)]" applicable to simpler data types.
3 See the SQL 2003 grammar for precise specification of INTERVAL type.
4 JDBC's java.sql.Types defines many other types that do not appear in any of the SQL standards, but correspond to database type systems.


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