如何在mySQL查詢中爲每個結果插入記錄？

Question

你好，我叫MySQL查詢選擇控制檯（或在phpMyAdmin SQL CMD）

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

這一點，我需要從之前的每個返回行中執行命令後選擇

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; 

我該怎麼做「foreach」循環在mysql中？

Answer 1

您可以使用單個查詢insert . . . select進行此操作。不需要循環，但你確實想檢查是否存在：

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;