show columns in table sql code example

Example 1: show table columns

-- MySQL
DESCRIBE tableName;
SHOW COLUMNS FROM tableName;

-- SQLite3
.schema tableName

Example 2: MySql get fields of table

SELECT COLUMN_NAME
  FROM INFORMATION_SCHEMA.COLUMNS
  WHERE TABLE_SCHEMA = 'my_database' AND TABLE_NAME = 'my_table';

Example 3: sql all columns

-- MySQL
SELECT * 
FROM INFORMATION_SCHEMA.COLUMNS;

-- SQL Server (possible solution)
SELECT * 
FROM SYS.COLUMNS;

-- Oracle
SELECT * 
FROM ALL_TAB_COLS; -- (If you only want user-defined columns)
-- ALL_TAB_COLS : only user-defined columns
-- ALL_TAB_COLUMNS : both user-defined AND system columns

Example 4: sql show columns in table

DESCRIBE table1;

-- result:
+----------------------+---------------------------+------+-----+-------------------+
| Field                | Type                      | Null | Key | Default           | Extra                                         |
+----------------------+---------------------------+------+-----+-------------------+
| film_id              | smallint(5) unsigned      | NO   |     | 0                 |                                               |
| title                | varchar(128)              | NO   |     | NULL              |                                               |
| description          | text                      | YES  |     | NULL              |                                               |
| release_year         | year(4)                   | YES  |     | NULL              |                                               |
| language_id          | tinyint(3) unsigned       | NO   |     | NULL              |                                               |
| original_language_id | tinyint(3) unsigned       | YES  |     | NULL              |                                               |
| rental_duration      | tinyint(3) unsigned       | NO   |     | 3                 |                                               |
| rental_rate          | decimal(4,2)              | NO   |     | 4.99              |