字符串自变量值不符合函数的要求,新手,跪求大神指导
SELECTID,NAME,GRADE,''CITYFROMDEMO03)UNIONALLSELECTID,NAME,''GRADE,CITYFROMDEMO04;...
SELECT ID ,NAME,GRADE,'' CITY FROM DEMO03)
UNION ALL
SELECT ID ,NAME,'' GRADE,CITY FROM DEMO04; 展开
UNION ALL
SELECT ID ,NAME,'' GRADE,CITY FROM DEMO04; 展开
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