Question

UPDATE sch_scores s1 
   SET s1.Score = '4' 
WHERE EXISTS (select * 
              from sch_scores s2 
              WHERE s2.ResultID = "24614" 
                AND s2.FormatID = "9" 
                AND s2.Score = "4")

您无法在FROM子句
中为更新指定目标表's1'

上述查询时出现错误。请问可能是什么问题？

Answer 1

UPDATE sch_scores 
SET Score = '4' 
WHERE EXISTS (select * 
              from sch_scores s2 
              WHERE s2.ResultID = "24614" 
                AND s2.FormatID = "9" 
                AND s2.Score = "4")

Answer 2

无需在update子句中指定实例（删除s1）

UPDATE sch_scores
    SET Score = '4' 
    WHERE EXISTS (select * from sch_scores s2 WHERE s2.ResultID = "24614" AND s2.FormatID = "9" AND s2.Score = "4")

Answer 3

您无法在更新查询中提供别名“s1”。在更新时，没有必要给表提供临时名称吗？

 UPDATE sch_scores
   SET Score = '4' 
WHERE EXISTS (select * 
              from sch_scores s2 
              WHERE s2.ResultID = "24614" 
                AND s2.FormatID = "9" 
                AND s2.Score = "4")

您无法指定目标表格＆＃39; s1＆＃39;用于FROM子句中的更新

3 个答案: