Let’s say you want to add multiple columns vendor and company. Let’s say you want to add new column transactions with default value 0. Here’s an example of how to add column with default value, using DEFAULT keyword. In the above examples, the new columns assume default value of null, since we have not specified it. | category | varchar(255) | YES | | NULL | | Let’s say you want to add a new column category after order_id mysql> alter table ordersĪdd column category varchar(255) after order_id | product | varchar(255) | YES | | NULL | |īonus Read : MySQL DROP FOREIGN KEY CONSTRAINT | Field | Type | Null | Key | Default | Extra | Let’s say you want to add column product to this table. mysql> create table orders(order_id int, amount int) Let’s say you have the following table orders. Here’s an example of how to add column in MySQL. Here’s the syntax ALTER TABLE tableĪDD column_name_1 column_1_definition ,ĪDD column_name_2 column_2_definition , If you want to add multiple columns in MySQL, you need to specify separate ADD COLUMN statements for each new column. You need to specify new column name in place of column_name and its definition, that is, data type, in place of column_definitionįinally, you can also specify the position of your new column using optional arguments such as FIRST, or AFTER column_name where you specify after which column you want to add the new column.īonus Read : MySQL DROP UNIQUE CONSTRAINT In the second line, COLUMN is an optional keyword. In the above query, mention table name in place of table after ALTER TABLE ALTER TABLE tableĪDD column_name column_definition Here’s the syntax of MySQL ADD COLUMN statement. Here are the steps to add column to existing MySQL table using MySQL ADD COLUMN query. Here’s how to add column in MySQL using MySQL ADD COLUMN statement. Sometimes you may need to add columns to existing tables.
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