COLUMNS view¶
This Information Schema view displays a row for each column in the tables defined in the specified (or current) database.
- See also:
Columns¶
Column |
Data Type |
Description |
---|---|---|
TABLE_CATALOG |
TEXT |
Database that the table belongs to. |
TABLE_SCHEMA |
TEXT |
Schema that the table belongs to. |
TABLE_NAME |
TEXT |
Table or view that the column belongs to. |
COLUMN_NAME |
TEXT |
Name of the column. |
ORDINAL_POSITION |
NUMBER |
Ordinal position of the column in the table. |
COLUMN_DEFAULT |
TEXT |
Default value of the column. |
IS_NULLABLE |
TEXT |
‘YES’ if the column may contain NULL, ‘NO’ otherwise. |
DATA_TYPE |
TEXT |
Data type of the column. |
CHARACTER_MAXIMUM_LENGTH |
NUMBER |
Maximum length in characters of string columns. |
CHARACTER_OCTET_LENGTH |
NUMBER |
Maximum length in bytes of string columns. |
NUMERIC_PRECISION |
NUMBER |
Numeric precision of numeric columns. |
NUMERIC_PRECISION_RADIX |
NUMBER |
Radix of precision of numeric columns. |
NUMERIC_SCALE |
NUMBER |
Scale of numeric columns. |
DATETIME_PRECISION |
NUMBER |
Not applicable for Snowflake. |
INTERVAL_TYPE |
TEXT |
Not applicable for Snowflake. |
INTERVAL_PRECISION |
NUMBER |
Not applicable for Snowflake. |
CHARACTER_SET_CATALOG |
TEXT |
Not applicable for Snowflake. |
CHARACTER_SET_SCHEMA |
TEXT |
Not applicable for Snowflake. |
CHARACTER_SET_NAME |
TEXT |
Not applicable for Snowflake. |
COLLATION_CATALOG |
TEXT |
Not applicable for Snowflake. |
COLLATION_SCHEMA |
TEXT |
Not applicable for Snowflake. |
COLLATION_NAME |
TEXT |
Not applicable for Snowflake. |
DOMAIN_CATALOG |
TEXT |
Not applicable for Snowflake. |
DOMAIN_SCHEMA |
TEXT |
Not applicable for Snowflake. |
DOMAIN_NAME |
TEXT |
Not applicable for Snowflake. |
UDT_CATALOG |
TEXT |
Not applicable for Snowflake. |
UDT_SCHEMA |
TEXT |
Not applicable for Snowflake. |
UDT_NAME |
TEXT |
Not applicable for Snowflake. |
SCOPE_CATALOG |
TEXT |
Not applicable for Snowflake. |
SCOPE_SCHEMA |
TEXT |
Not applicable for Snowflake. |
SCOPE_NAME |
TEXT |
Not applicable for Snowflake. |
MAXIMUM_CARDINALITY |
NUMBER |
Not applicable for Snowflake. |
DTD_IDENTIFIER |
TEXT |
Not applicable for Snowflake. |
IS_SELF_REFERENCING |
TEXT |
Not applicable for Snowflake. |
IS_IDENTITY |
TEXT |
Whether this column is an identity column. |
IDENTITY_GENERATION |
TEXT |
Whether an identity column’s value is always generated or only generated by default. Snowflake only supports BY DEFAULT. |
IDENTITY_START |
TEXT |
The START value from |
IDENTITY_INCREMENT |
TEXT |
The INCREMENT value from |
IDENTITY_MAXIMUM |
TEXT |
Not applicable for Snowflake. |
IDENTITY_MINIMUM |
TEXT |
Not applicable for Snowflake. |
IDENTITY_CYCLE |
TEXT |
Whether the value of an identity column may cycle. Snowflake only supports NO CYCLE. |
IDENTITY_ORDERED |
TEXT |
If |
SchemaEvolutionRecord |
TEXT |
Records information about the latest triggered Schema Evolution for a given table column. This column contains the following subfields:
|
COMMENT |
TEXT |
Comment for this column. |
Usage notes¶
The view only displays objects for which the current role for the session has been granted access privileges. The view does not honor the MANAGE GRANTS privilege and consequently may show less information compared to a SHOW command when both are executed by a user who holds the MANAGE GRANTS privilege.
Examples¶
Retrieve all columns in the myTable
table defined in the mydb
database:
USE DATABASE mydb;
SELECT *
FROM INFORMATION_SCHEMA.COLUMNS WHERE table_name = 'myTable';