mysql判斷字段是否存在方法

1. desc 命令

格式: desc tablename columnname

例子:

desc `table` `mid`

desc `table` '%abc%'

2. show columns 命令

格式: show columns from tablename like columnname

例子:

show columns from `table` like 'mid'

show columns from `table` like '%abc%'

3. describe 命令

格式: describe tablename columnname

describe 相當于 show columns from

例子:

describe `table` `mid`

describe `table` '%abc%'