php - postgresql/php 中的 SQL 语法错误

Question

这是我的sql

$sqltable3=
'SELECT 
"Publications"."Pub_ID", 
"Questions"."Question" 
FROM "Publications" 
LEFT JOIN "Aspect_Pub_join" ON "Publications"."Pub_ID"="Aspect_Pub_join"."Pub_ID" 
LEFT JOIN "Aspect_question_join" ON "Aspect_Pub_join"."Aspect_ID"="Aspect_question_join"."Aspect_ID" 
LEFT JOIN "Questions" ON "Aspect_question_join"."Question_ID"="Questions"."Question_ID" 
Where "Publications"."Pub_ID"=$1 
GROUP BY "Questions"."Question" 
ORDER BY "Publications"."Pub_ID" ASC';

这是错误:

Warning: pg_query_params(): Query failed: ERROR: column "Publications.Pub_ID" must appear in the GROUP BY clause or be used in an aggregate function LINE 1: SELECT "Publications"."Pub_ID", "Questions"."Question" FROM ... ^ in ...

我在 order by 中使用 Publications.Pub_ID 作为聚合函数，所以我不确定哪里出错了？同样的查询在 mysql 中运行良好(我知道它不那么挑剔)。

如果我取消 group by 和 order by 函数，则 sql 会运行，但显然不会返回所需的结果。

Answer 1

需要在分组依据中包含 Publications。

$sqltable3=
'SELECT 
"Publications"."Pub_ID", 
"Questions"."Question" 
FROM "Publications" 
LEFT JOIN "Aspect_Pub_join" ON "Publications"."Pub_ID"="Aspect_Pub_join"."Pub_ID" 
LEFT JOIN "Aspect_question_join" ON "Aspect_Pub_join"."Aspect_ID"="Aspect_question_join"."Aspect_ID" 
LEFT JOIN "Questions" ON "Aspect_question_join"."Question_ID"="Questions"."Question_ID" 
Where "Publications"."Pub_ID"=$1 
GROUP BY "Questions"."Question", 
"Publications"."Pub_ID" 
ORDER BY "Publications"."Pub_ID" ASC';