sql添加列
ALTER TABLE Customers
ADD Email varchar(255);
如何将列添加到表sql
ALTER TABLE table_name ADD column_name varchar(50);
在表中添加新列
ALTER TABLE table ADD [COLUMN] column_name;
在mysql中更改数据类型
ALTER TABLE table_name
CHANGE COLUMN column_name column_name datatype;
在表中添加新列
ALTER TABLE vendors
ADD COLUMN phone VARCHAR(15) AFTER name;
Code language: SQL (Structured Query Language) (sql)