增加字段的sql语句

增加字段的SQL语句可以使用ALTER TABLE语句。例如，要向名为table_name的表中添加一个名为column_name的新字段，可以使用以下语句：
ALTER TABLE table_name ADD COLUMN column_name VARCHAR(100) DEFAULT NULL COMMENT '新加字段' AFTER old_column; [1]
这将在table_name表中添加一个名为column_name的VARCHAR类型字段，长度为100，默认值为NULL，并在old_column字段之后。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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