Difference between revisions of "SYSCOLUMNS"
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==Purpose== | ==Purpose== | ||
Description of the table columns available in the catalog | Description of the table columns available in the catalog | ||
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==See Also== | ==See Also== | ||
[[SQL Data Types|DATA TYPES]], [[SQL SELECT|SELECT]], [[SQL System Tables|SYSTEM TABLES]] | [[SQL Data Types|DATA TYPES]], [[SQL SELECT|SELECT]], [[SQL System Tables|SYSTEM TABLES]] | ||
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==Description== | ==Description== | ||
System Tables are system defined read-only tables. You can query these tables using the SELECT statement. | System Tables are system defined read-only tables. You can query these tables using the SELECT statement. | ||
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{| class="wikitable" | {| class="wikitable" | ||
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==Example== | ==Example== | ||
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</code> | </code> | ||
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[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:SQL]] | [[Category:SQL]] | ||
[[Category:System Tables]] | [[Category:System Tables]] | ||
Revision as of 10:52, 7 December 2012
Contents
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. |
Example
SELECT * FROM syscolumns; WHERE type_name = 'DATETIME'
