Question

您好我在控制台（或在phpmyadmin sql cmd中）调用mysql查询选择

SELECT HF, ID FROM AH WHERE HF !=0 GROUP BY HF;

在此之后，我需要为之前选择的每个返回行执行命令

foreach
  IF (SELECT COUNT(*) FROM `TOT` WHERE `ID` = @selectedID AND `Uto` = @selectedHF ) = 0 THEN    
      INSERT INTO `TOT` (`ID`, `HF`) VALUES (@selectedID, @selectedHF);
  END IF;
endforeach;

如何在mysql中执行“foreach”循环？

Answer 1

您可以使用单个查询insert . . . select执行此操作。不需要循环，但你确实想检查不存在：

INSERT INTO `TOT` (`ID`, `HF`) 
    SELECT ID, HF
    FROM AH a
    WHERE HF <> 0 AND 
          NOT EXISTS (SELECT 1 FROM TOT WHERE TOT.ID = a.ID AND TOT.UTO = @selectedHF)
    GROUP BY HF;

如何在mySQL查询中插入每个结果的记录？

1 个答案: