How to modify field name in mysql

You can modify the field name in MySQL through the following steps: Use the ALTER TABLE statement to modify the field name directly. After making the modification, update the application and query code that references the field name. When changing the primary key field name, the primary key needs to be re-created. Changing field types and names can also be performed simultaneously. Multiple fields can be renamed simultaneously by using multiple CHANGE clauses.

How to modify the field name in MySQL

Modify the field name directly

You can directly modify the field name through the ALTER TABLE statement:

<code class="sql">ALTER TABLE table_name CHANGE old_column_name new_column_name data_type;</code>

For example, change the first_name field name in the users table to name：

<code class="sql">ALTER TABLE users CHANGE first_name name VARCHAR(255);</code>

Notes after modification

After modifying the field name, you need to pay attention to the following matters:

• Applications and queries will be affected and code that references this field name will need to be updated.
• Foreign key constraints and indexes will also be affected and need to be updated.
• If the primary key field name is modified, the primary key needs to be re-created.

Change field type and name

You can also change field type and name at the same time:

<code class="sql">ALTER TABLE table_name CHANGE old_column_name new_column_name new_data_type;</code>

For example, change users The age field type in the table was changed from INT to VARCHAR(3) and the name was changed to age_string:

<code class="sql">ALTER TABLE users CHANGE age age_string VARCHAR(3);</code>

Renaming multiple fields

Multiple fields can be renamed by using multiple CHANGE clauses:

<code class="sql">ALTER TABLE table_name
CHANGE old_column_name1 new_column_name1 data_type1,
CHANGE old_column_name2 new_column_name2 data_type2,
...;</code>

For example , change the first_name and last_name field names in the users table to name and surname respectively:

<code class="sql">ALTER TABLE users
CHANGE first_name name VARCHAR(255),
CHANGE last_name surname VARCHAR(255);</code>

The above is the detailed content of How to modify field name in mysql. For more information, please follow other related articles on the PHP Chinese website!