PostgreSQL - Using a Subquery to Update Multiple Column Values

后端未结

关注

 7  957

无人共我 2021-02-02 08:01

I need to be able to update multiple columns on a table using the result of a subquery. A simple example will look like below -

UPDATE table1
SET (col1, col2) =


      
      
        
          7条回答        

        
                    
            
            
                         
                
              
              
                
                   旧时难觅i
                                             
                
                
                (楼主)
            
              
              
                2021-02-02 08:25
              

            
            
                        
As the official document says: you can use the standard update Synopsis of PostgreSQL update


UPDATE table
    SET { column = { expression | DEFAULT } |
          ( column [, ...] ) = ( { expression | DEFAULT } [, ...] ) } [, ...]
    [ FROM from_list ]
    [ WHERE condition ]


So you can use write like this:


UPDATE table1
SET TOTAL_MIN_RATE = subQuery."minRate",
 TOTAL_MAX_RATE = subQuery.maxRate
FROM
    (
        SELECT
            AVG (o.MIN_RATE) AS minRate,
            AVG (o.MAX_RATE) AS maxRate
        FROM
            ORDR o
        INNER JOIN table2 ba ON (o.PAY_ACCT_ID = ba.ACCT_ID)
        INNER JOIN table3 mb ON (ba.BANK_ID = mb.BANK_ID)
        WHERE
            ba.CNTRY_ID = table1.CNTRY_ID
        AND o.STUS_CD IN (
            '01',
            '02',
            '03',
            '04',
            '05',
            '06'
        )
        AND (
            (
                o.FRO_CRNCY_ID = table1.TO_CRNCY_ID
                AND o.TO_CRNCY_ID = table1.FRO_CRNCY_ID
            )
            OR (
                o.TO_CRNCY_ID = table1.TO_CRNCY_ID
                AND o.FRO_CRNCY_ID = table1.FRO_CRNCY_ID
            )
        )
        GROUP BY
            ba.CNTRY_ID
    ) subQuery;


Or a more simple way:


UPDATE table1
SET (
    TOTAL_MIN_RATE,
    TOTAL_MAX_RATE
) = (
    SELECT
        AVG (o.MIN_RATE) AS minRate,
        AVG (o.MAX_RATE) AS maxRate
    FROM
        ORDR o
    INNER JOIN table2 ba ON (o.PAY_ACCT_ID = ba.ACCT_ID)
    INNER JOIN table3 mb ON (ba.BANK_ID = mb.BANK_ID)
    WHERE
        ba.CNTRY_ID = table1.CNTRY_ID
    AND o.STUS_CD IN (
        '01',
        '02',
        '03',
        '04',
        '05',
        '06'
    )
    AND (
        (
            o.FRO_CRNCY_ID = table1.TO_CRNCY_ID
            AND o.TO_CRNCY_ID = table1.FRO_CRNCY_ID
        )
        OR (
            o.TO_CRNCY_ID = table1.TO_CRNCY_ID
            AND o.FRO_CRNCY_ID = table1.FRO_CRNCY_ID
        )
    )
    GROUP BY
        ba.CNTRY_ID
);

    
             
                                                        
            
            
              
                
                0
              
                   
                
               讨论(0)
              
                                                  
              
              
                          
             
       
          
              
                                       
     查看其它7个回答


            
                         
                    


               
            
    发布评论:
    
         
                        
    
    提交评论 
  
  

                    
                    
                    
                        
                        
                         加载中...
                        
                    
                
          
                              			
        
        
        
          
            
            
              
              
            
    


                                 
              
            
                          
    

        
         
                验证码
                
                  
                
                
                   看不清?
                
              
                                  
                    
   
                 
             
              提交回复