添加列

代码示例

追加列sql

ALTER TABLE table_name
ADD column_name datatype;

--example
ALTER TABLE Customers
ADD Email varchar(255);

创建列sql server

ALTER TABLE table_name
ADD column_name datatype;

向表sql添加多个列

ALTER TABLE table_name
  ADD column_1 column_definition,
      column_2 column_definition,
      ...
      column_n column_definition;

在表中添加新列

ALTER TABLE table ADD [COLUMN] column_name;

现有表中的sql更改列

'This adds 'NOT NULL' to excisting column counting in the table mytable'
ALTER TABLE mytable ALTER COLUMN counting INT NOT NULL;

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empty row

添加列

代码示例

追加列sql

创建列sql server

向表sql添加多个列

在表中添加新列

现有表中的sql更改列

类似页面

带有示例的类似页面

其他语言

此页面有其他语言版本

受欢迎的此类别

标籤的相关热门网页