MySQL Alter Table Statement Exercises: Add a columns ID as the first column of the table locations
MySQL Alter Table Statement: Exercise-3 with Solution
Write a SQL statement to add a columns ID as the first column of the table locations.
Here is the structure of the table locations.
mysql> SHOW COLUMNS FROM locations; +----------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------------+--------------+------+-----+---------+-------+ | LOCATION_ID | decimal(4,0) | YES | | NULL | | | STREET_ADDRESS | varchar(40) | YES | | NULL | | | POSTAL_CODE | varchar(12) | YES | | NULL | | | CITY | varchar(30) | YES | | NULL | | | STATE_PROVINCE | varchar(25) | YES | | NULL | | | COUNTRY_ID | varchar(2) | YES | | NULL | | +----------------+--------------+------+-----+---------+-------+
Code:
ALTER TABLE locations
ADD ID INT FIRST;
Let execute the above code in MySQL 5.6 command prompt
See the structure of the table after alteration.
mysql> SHOW COLUMNS FROM locations;
+----------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------+--------------+------+-----+---------+-------+
| ID | int(11) | YES | | NULL | |
| LOCATION_ID | decimal(4,0) | YES | | NULL | |
| STREET_ADDRESS | varchar(40) | YES | | NULL | |
| POSTAL_CODE | varchar(12) | YES | | NULL | |
| CITY | varchar(30) | YES | | NULL | |
| STATE_PROVINCE | varchar(25) | YES | | NULL | |
| COUNTRY_ID | varchar(2) | YES | | NULL | |
+----------------+--------------+------+-----+---------+-------+
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Previous: Write a SQL statement to add a column region_id to the table locations.
Next: Write a SQL statement to add a column region_id after state_province to the table locations.
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