SQL 查询中的行到列

Posted 2023-05-09

【中文标题】SQL 查询中的行到列

【英文标题】：ROWS TO COLUMNS IN SQL QUERY

【发布时间】：2020-07-21 13:43:05

【问题描述】：

由于我没有明确提出我的最后一个问题，所以我会重新提出我的问题 -

Effective_date                Result_value      Elementname         Person_number       
     10-JAN-2020                    4.6             Taxable Earnings    10
     10-JUN-2020                    5               Taxable Earnings    10
     01-JAN-2020                    3.2             Basic Life          10
     10-FEB-2020                    1.6             Basic Life          10
     11-JAN-2020                    2.2             Tax Units           10       
     11-JUL-2020                    1.2             Tax Units           10
     
     

我有以下查询 -

SELECT ppa.effective_date,
pra.result_value ,
pra.elementname,
prd.person_number

FROM   pay_pay_relationships_dn prd
       INNER JOIN pay_payroll_rel_actions pra
               ON prd.payroll_relationship_id = pra.payroll_relationship_id
       INNER JOIN pay_payroll_actions ppa
               ON pra.payroll_action_id = ppa.payroll_action_id
       INNER JOIN pay_all_payrolls_f pap
               ON ppa.element_type_id = pap.element_type_id
WHERE  ( and pra.elementname = 'Taxable Earnings'
         AND ppa.payroll_id = pap.payroll_id ) 
         
     This query will give a resultant as - 
     
     effective_date                result_value     elementname         person_number       
     10-JAN-2020                    4.6             Taxable Earnings    10
     10-JUN-2020                    5               Taxable Earnings    10

     ----------------------------------------------------------------------------------------------------------------------------------
     

如果有效日期介于我通过的 start_date 和 end_date 之间，我希望输出类似于 result_value 的总和。所以最后的查询

     I am using is this to get the desired output-
     
     

SELECT   SUM(result_value) taxable_earn, 
         person_number 
FROM     ( 
                    SELECT     ppa.effective_date, 
                               pra.result_value , 
                               pra.elementname, 
                               prd.person_number 
                    FROM       pay_pay_relationships_dn prd 
                    inner join pay_payroll_rel_actions pra 
                    ON         prd.payroll_relationship_id = pra.payroll_relationship_id 
                    inner join pay_payroll_actions ppa 
                    ON         pra.payroll_action_id = ppa.payroll_action_id 
                    inner join pay_all_payrolls_f pap 
                    ON         ppa.element_type_id = pap.element_type_id 
                    WHERE      ( 
                               and        pra.elementname = 'Taxable Earnings' 
                               AND        ppa.payroll_id = pap.payroll_id ) 
                    AND        ppa.effective_date BETWEEN :p_start_date AND        :p_end_date )
GROUP BY person_number
     
     person_number          taxable_earn        
     10                     9.6

我希望输出包含元素名称 result_value ——“基本生活”、“税收单位”在上述输出中的单独列中出现——

      person_number     taxable_earn            Basic_Life          Tax_Units         
     10                     9.6                  4.8                    3.4
     
     
     

如何调整查询以获得如上所示的输出？

【参考方案1】：

您可以尝试使用枢轴进行以下查询 -

SELECT   * 
  FROM   (SELECT     ppa.effective_date, 
                     pra.result_value , 
                     pra.elementname, 
                     prd.person_number 
            FROM     pay_pay_relationships_dn prd 
           INNER JOIN pay_payroll_rel_actions pra ON prd.payroll_relationship_id = pra.payroll_relationship_id 
           INNER JOIN pay_payroll_actions ppa ON pra.payroll_action_id = ppa.payroll_action_id 
           INNER JOIN pay_all_payrolls_f pap ON ppa.element_type_id = pap.element_type_id 
           WHERE ppa.payroll_id = pap.payroll_id
             AND ppa.effective_date BETWEEN :p_start_date AND :p_end_date)
 PIVOT    (SUM(result_value )
           FOR elementname IN ('taxable_earn' taxable_earn, 'Basic_Life' Basic_Life, 'Tax_Units' Tax_Units))

【讨论】：

这并不完全奏效。自从我提出这个问题以来已经有很多天了，我对我的问题提出了一个单独的问题