SYSCOLUMNS

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Purpose

Description of the table columns available in the catalog

See Also

DATA TYPES, SELECT, SYSTEM TABLES

Description

System Tables are system defined read-only tables. You can query these tables using the SELECT statement.

Column Data Type Width Description
TABLE_CAT C 30 Table catalog
TABLE_SCHEM C 30 Table schema
TABLE_NAME C 30 Table name
COLUMN_NAME C 25 Column name
DATA_TYPE N 2 SQL data type
TYPE_NAME C 30 Data source dependent type name
COLUMN_SIZE N 3 Precision
BUFFER_LENGTH L 1 Reserved
DECIMAL_DIGITS N 2 Scale
NUM_PREC_RADIX N 2 Radix (typically either 10 or 2)
NULLABLE N 2 Is NULL allowed?
REMARKS C 25 Comment describing column
COLUMN_DEF C 30 Default value
SQL_DATA_TYPE N 1 Reserved
SQL_DATETIME_SUB N 1 Reserved
CHAR_OCTET_LENGTH N 1 For char types the maximum number of bytes in the column
ORDINAL_POSITION N 4 Index of column in table (starting at 1)
IS_NULLABLE C 3 "NO" means column definitely does not allow NULL values; "YES" means the column might allow NULL values. An empty string means unknown.

Return values for Lianja field types are shown in the table below.

Field Type TYPE_NAME DATA_TYPE
Character CHAR 1
Numeric NUMERIC 2
Logical BOOLEAN -7
Varchar LONG VARCHAR -4
Blob LONG VARBINARY -4
Currency CURRENCY 0
Date DATE 91
Datetime DATETIME 93
Int INTEGER 2
Float FLOAT 8
Short SHORT 5
Real REAL 7
Json LONG VARCHAR -4

Example

SELECT * FROM syscolumns;
WHERE type_name = 'DATETIME'