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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
