Java s请标记特定的数据库。根据错误消息，我猜是Oracle。感谢您的回复。在oracle环境中，我面临的问题是非常感谢您。在子查询和主查询中都添加了rownum=1后，获得了该值。在子查询和主查询中添加rownum=1后获取值 (select

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s请标记特定的数据库。根据错误消息，我猜是Oracle。感谢您的回复。在oracle环境中，我面临的问题是非常感谢您。在子查询和主查询中都添加了rownum=1后，获得了该值。在子查询和主查询中添加rownum=1后获取值

(select      
     (case when (coalesce(t1.col1,t2.col1, t1.col2, t1.col3) is null)
          then (select sysdate from dual) 
          else (coalesce(t1.col1,t2.col1, t1.col2, t1.col3)) 
     end  )  
from table1 t1
join table2 t2 
    on t1.id IN (t2.id))

select      
     case when coalesce(t1.col1,t2.col1, t1.col2, t1.col3) is null
          then  sysdate 
          else coalesce(t1.col1,t2.col1, t1.col2, t1.col3) 
     end    
from table1 t1
join table2 t2  on t1.id = t2.id

<select id="Trigger" parameterType="hashmap" resultType="java.util.HashMap" flushCache="true"> 

    SELECT 
        select case when coalesce(table1.col1, table2.col2,table1.col3, table1.col4) is null 
        then  sysdate 
        else coalesce(table1.col1, table2.col2,table1.col3, table1.col4) end as "ProgressDate"
        , table3.id as "ID" 
        from table1 
        INNER join table2 on table1.id = table2.id 
        INNER JOIN table3 ON table1.id = table3.id 
        INNER JOIN table4 table2.action = table4.action 
        WHERE table3.transaction = #{inputvaluepassed} 
        
</select> 

SELECT 
  (
    select case when coalesce(table1.col1, table2.col2,table1.col3,
                                table1.col4) is null 
                then (select sysdate from dual) 
                else coalesce(table1.col1, table2.col2,table1.col3, table1.col4)
           end
    from table1 
    join table2 on table1.id = table2.id
  ) as "ProgressDate", 
  table3.id as "ID" 
FROM table3, table1, table2, table4 
WHERE table3.transaction = #{inputvaluepassed} 
  AND table1.id = table3.id 
  AND table2.id=table1.id and table2.action = table4.action

SELECT 
  (
    select case when coalesce(table1.col1, table2.col2,table1.col3,
                                table1.col4) is null 
                then (select sysdate from dual) 
                else coalesce(table1.col1, table2.col2,table1.col3, table1.col4)
           end
    from table1 
    join table2 on table1.id = table2.id
    limit 1 -- added this line
  ) as "ProgressDate", 
  table3.id as "ID" 
FROM table3, table1, table2, table4 
WHERE table3.transaction = #{inputvaluepassed} 
  AND table1.id = table3.id 
  AND table2.id=table1.id and table2.action = table4.action