[if语句](MySQL%E6%B5%81%E7%A8%8B%E6%8E%A7%E5%88%B6-if%E8%AF%AD%E5%8F%A5.md) [case语句](case%E8%AF%AD%E5%8F%A5.md) [while循环语句](while%E5%BE%AA%E7%8E%AF%E8%AF%AD%E5%8F%A5.md) [repeat循环语句](repeat%E5%BE%AA%E7%8E%AF%E8%AF%AD%E5%8F%A5.md) [loop循环语句](loop%E5%BE%AA%E7%8E%AF%E8%AF%AD%E5%8F%A5.md)