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Editorial Team
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Asked: 2026-06-12T18:28:22+00:00

I have a simple table (ID, Member_ID, payment, date, payment_serial, running_total); I need the

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I have a simple table (ID, Member_ID, payment, date, payment_serial, running_total); I need the payment_serial to use the data for export to another system.

The export I need is all the payments made by a member (showing payment & date), sorted in order of the payment_serial and in a single row.

This was the first query I used:

SELECT
  `Member_ID`,
  IF(`payment_serial`=1,`payment`,0) AS `p1`,
  IF(`payment_serial`=1,`date`,0) AS `p1_date`,
  IF(`payment_serial`=1,`ID`,0) AS `p1_ID`,
  IF(`payment_serial`=2,`payment`,0) AS `p2`,
  IF(`payment_serial`=2,`date`,0) AS `p2_date`
  IF(`payment_serial`=2,`ID`,0) AS `p2_ID`,
FROM monthlies
WHERE `Member_ID` = 4198739

If I use this query, I see the payments I need, but each on a separate row (which creates big import problems at the next stage):

Member_ID    p1     p1_date  p1_ID    p2    p2_date  p2_ID ...
  4198739   34.50    41143    214      0      0       0    ... 
  4198739     0        0       0     34.50  41176    583   ...

I added GROUP BY:

SELECT
  IF(`payment_serial`=1,`payment`,0) AS `p1`,
  IF(`payment_serial`=1,`date`,0) AS `p1_date`,
  IF(`payment_serial`=1,`ID`,0) AS `p1_ID`,
  IF(`payment_serial`=2,`payment`,0) AS `p2`,
  IF(`payment_serial`=2,`date`,0) AS `p2_date`,
  IF(`payment_serial`=2,`ID`,0) AS `p2_ID`
FROM monthlies
WHERE `Member_ID` = 4198739
GROUP BY `Member_ID`

This gives me a single row for each member – but not each payment:

Member_ID    p1     p1_date  p1_ID    p2    p2_date  p2_ID ...
  4198739   34.50    41143    214      0      0       0    ...

Where am I going wrong?

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1 Answer

  1. Editorial Team

    It’s not entirely your fault. MySQL implements GROUP BY wrong. Any other SQL platform would give you a syntax error at this point.

    Try

    SELECT 
  MAX(IF(`payment_serial`=1,`payment`,0)) AS `p1`, 
  MAX(IF(`payment_serial`=1,`date`,0)) AS `p1_date`, 
  MAX(IF(`payment_serial`=1,`ID`,0)) AS `p1_ID`, 
  MAX(IF(`payment_serial`=2,`payment`,0)) AS `p2`, 
  MAX(IF(`payment_serial`=2,`date`,0)) AS `p2_date`, 
  MAX(IF(`payment_serial`=2,`ID`,0)) AS `p2_ID` 
FROM monthlies 
WHERE `Member_ID` = 4198739 
GROUP BY `Member_ID`
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