sql添加列
ALTER TABLE Customers
ADD Email varchar(255);
alter table添加列
ALTER TABLE table
ADD COLUMN column VARCHAR (255) NOT NULL AFTER column;
在表中添加新列
ALTER TABLE table ADD [COLUMN] column_name;
在表中添加新列
ALTER TABLE vendors
ADD COLUMN phone VARCHAR(15) AFTER name;
Code language: SQL (Structured Query Language) (sql)