Add column in table

Alter table add column

ALTER TABLE table
ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;

Alter table add column

ALTER TABLE table_name
ADD column_name datatype;

Add column in table

ALTER TABLE table_name
  ADD column_name column_definition;

Add a new column into table

ALTER TABLE table ADD [COLUMN] column_name;

Source: mysqltutorial.org

T-SQL Add Column

ALTER TABLE sales.quotations 
    ADD 
        amount DECIMAL (10, 2) NOT NULL,
        customer_name VARCHAR (50) NOT NULL;
Code language: SQL (Structured Query Language) (sql)

Source: sqlservertutorial.net

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