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Editorial Team
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Asked: 2026-06-14T07:56:35+00:00

I’ve got a little problem with a simple query. Here it is: SELECT `T_COURS`.`COU_DATE`,

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I’ve got a little problem with a simple query. Here it is:

SELECT `T_COURS`.`COU_DATE`,
`T_SESSIONS`.*,
`T_FORMATIONS`.`FOR_TITRE`, `T_FORMATIONS`.`FOR_ID`, `T_FORMATIONS`.`FOR_TITRE`,     `T_FORMATIONS`.`FOR_CATEGORIE`,
`T_FORMATIONS`.`FOR_DESCRIPTION`, `T_FORMATIONS`.`FOR_MIN_PART`, `T_FORMATIONS`.`FOR_MAX_PART`, `T_FORMATIONS`.`FOR_PRIX`, `T_FORMATIONS`.`FOR_LANGUE`
FROM `T_FORMATIONS`
INNER JOIN `T_COURS` ON `T_SESSIONS`.`SES_ID` = `T_COURS`.`COU_SES_ID`
INNER JOIN `T_SESSIONS` ON `T_FORMATIONS`.`FOR_ID` = `T_SESSIONS`.`SES_FOR_ID`
WHERE `T_SESSIONS`.`SES_ETAT` = 1
ORDER BY `T_COURS`.`COU_DATE` ASC, `T_SESSIONS`.`SES_TITRE` ASC, `T_FORMATIONS`.`FOR_TITRE` ASC LIMIT 5

When I try to run it, I get this message :

#1054 - Unknown column 'T_SESSIONS.SES_ID' in 'on clause'

I don’t really understand why because everything exists in my database?

I looked for answers on the Internet but it didn’t help me (or maybe I didn’t understand the answers I read).

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1 Answer

  1. Editorial Team

    Without seeing your full table structure, I would start by swapping your JOIN order, you are joining T_SESSIONS after you are trying to use it in your current version. You currently have:

    FROM `T_FORMATIONS`
INNER JOIN `T_COURS` 
  ON `T_SESSIONS`.`SES_ID` = `T_COURS`.`COU_SES_ID`
INNER JOIN `T_SESSIONS` 
  ON `T_FORMATIONS`.`FOR_ID` = `T_SESSIONS`.`SES_FOR_ID`

    change it to:

    FROM `T_FORMATIONS`
INNER JOIN `T_SESSIONS` 
  ON `T_FORMATIONS`.`FOR_ID` = `T_SESSIONS`.`SES_FOR_ID`
INNER JOIN `T_COURS` 
  ON `T_SESSIONS`.`SES_ID` = `T_COURS`.`COU_SES_ID`

    Making your full query:

    SELECT `T_COURS`.`COU_DATE`,
  `T_SESSIONS`.*,
  `T_FORMATIONS`.`FOR_TITRE`, 
  `T_FORMATIONS`.`FOR_ID`, 
  `T_FORMATIONS`.`FOR_TITRE`,     
  `T_FORMATIONS`.`FOR_CATEGORIE`,
  `T_FORMATIONS`.`FOR_DESCRIPTION`, 
  `T_FORMATIONS`.`FOR_MIN_PART`, 
  `T_FORMATIONS`.`FOR_MAX_PART`, 
  `T_FORMATIONS`.`FOR_PRIX`, 
  `T_FORMATIONS`.`FOR_LANGUE`
FROM `T_FORMATIONS`
INNER JOIN `T_SESSIONS` 
  ON `T_FORMATIONS`.`FOR_ID` = `T_SESSIONS`.`SES_FOR_ID`
INNER JOIN `T_COURS` 
  ON `T_SESSIONS`.`SES_ID` = `T_COURS`.`COU_SES_ID`
WHERE `T_SESSIONS`.`SES_ETAT` = 1
ORDER BY `T_COURS`.`COU_DATE` ASC, `T_SESSIONS`.`SES_TITRE` ASC, `T_FORMATIONS`.`FOR_TITRE` ASC 
LIMIT 5
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