Use this statement to print column information for a given table or view.
- If the object to be described is a table, one of the following conditions must be fulfilled:
- The current user has one of the following system privileges: SELECT ANY TABLE (or SELECT ANY DICTIONARY in context of system tables, respectively),INSERT ANY TABLE, UPDATE ANY TABLE, DELETE ANY TABLE, ALTER ANY TABLE or DROP ANY TABLE.
- The current user has any object privilege on the table.
- The table belongs to the current user or one of his roles.
- If the object to be described is a view, one of the following conditions must be fulfilled:
- The current user has one of the following system privileges: SELECT ANY TABLE or DROP ANY VIEW.
- The current user has any object privilege on the view.
- The view belongs to the current user or one of his roles.
- The SQL_TYPE column displays the datatype. In case of a string type, the used character set will be additionally shown (ASCII or UTF-8).
- The NULLABLE column indicates whether the column is permitted to contain NULL values.
- The value of columns DISTRIBUTION_KEY and PARTITION_KEY show whether the column is part of the distribution and partition keys (for additional information, see ALTER TABLE (distribution/partitioning)). For Views these values are always NULL.
- If you specify the option FULL, then the additional column COLUMN_COMMENT displays the column comment (cut to maximum 200 characters), if this was set either implicitly by the CREATE TABLE or CREATE VIEW command or explicitly by the COMMENT statement.
- DESCRIBE can be abbreviated by DESC (for example, DESC my_table;).
CREATE TABLE t (i DECIMAL COMMENT IS 'id column',
DISTRIBUTE BY i,
PARTITION BY d);