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我有兩個表:LEFT JOIN如何使用其中,如果右場存在
用戶(使用的字段查詢) - >
|uuid|name|last_name|email|rol |status|
|1234|abcd| abc |[email protected]|pre-thunder| 1 |
|5678|efgh| efg |[email protected]|pre-thunder| 1 |
而且documentation_thunder表(在查詢中使用的字段) - >
|id|id_thunder|doc_type|
|1 |1234 |image |
我儘量讓我的左表中的所有記錄,但更多的,我從我的右表中獲取計數:
SELECT
users.uuid,
users.email,
users.name,
users.last_name,
COUNT(documentation_thunder.id) as documentation// i need to know how many documents have the user
FROM users
LEFT JOIN documentation_thunder
ON users.uuid = documentation_thunder.id_thunder
WHERE
users.status = 1 AND users.rol = 'pre-thunder' AND (documentation_thunder.doc_type = 'image' OR documentation_thunder.doc_type IS NULL)
此查詢只返回第一個用戶,但我需要返回所有用戶,不管是否有文檔。
有什麼想法?我該怎麼做?
。謝謝Giorgos –