layout | title | displayTitle | license |
---|---|---|---|
global |
SHOW COLUMNS |
SHOW COLUMNS |
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contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
|
Returns the list of columns in a table. If the table does not exist, an exception is thrown.
SHOW COLUMNS table_identifier [ database ]
-
table_identifier
Specifies the table name of an existing table. The table may be optionally qualified with a database name.
Syntax:
{ IN | FROM } [ database_name . ] table_name
Note: Keywords
IN
andFROM
are interchangeable. -
database
Specifies an optional database name. The table is resolved from this database when it is specified. When this parameter is specified then table name should not be qualified with a different database name.
Syntax:
{ IN | FROM } database_name
Note: Keywords
IN
andFROM
are interchangeable.
-- Create `customer` table in `salesdb` database;
USE salesdb;
CREATE TABLE customer(
cust_cd INT,
name VARCHAR(100),
cust_addr STRING);
-- List the columns of `customer` table in current database.
SHOW COLUMNS IN customer;
+---------+
| col_name|
+---------+
| cust_cd|
| name|
|cust_addr|
+---------+
-- List the columns of `customer` table in `salesdb` database.
SHOW COLUMNS IN salesdb.customer;
+---------+
| col_name|
+---------+
| cust_cd|
| name|
|cust_addr|
+---------+
-- List the columns of `customer` table in `salesdb` database
SHOW COLUMNS IN customer IN salesdb;
+---------+
| col_name|
+---------+
| cust_cd|
| name|
|cust_addr|
+---------+