[英]Only show if date is less than 14 days ago
我有三張桌子 - 通知,通知和公司。 通知包含顯示在Web應用程序中的客戶通知列表,而notices_read是他們點擊並閱讀消息的指示符,因此在公司保存公司信息(包括其加入日期)時不再顯示該消息。 此外,我只希望向超過14天前加入的客戶顯示通知。
一切都在14天前的部分工作 - 如果我刪除該行,通知顯示正確,取決於notices_read中是否有值,但如果我在那時添加日期行,雖然沒有錯誤,但沒有返回任何內容。
companies
+-----------------+
| id | datestamp |
+-----------------+
| 1 | 2012-12-20 |
| 2 | 2012-12-20 |
| 3 | 2012-11-20 |
| 4 | 2012-11-20 |
+-----------------+
notices_read
+-----------------------------+
| id | company_id | notice_id |
+-----------------------------+
| 1 | 3 | 1 |
+-----------------------------+
notices
+----------------------+
| id | title | active |
+----------------------+
| 1 | title1 | 1 |
| 2 | title2 | 0 |
+----------------------+
這是我的查詢:
Select
notices.description,
notices.id,
notices.title,
notices_read.company_id,
companies.datestamp
From
notices Left Join
notices_read On notices.id = notices_read.dismiss_id Left Join
companies On notices_read.company_id = companies.id
Where
notices.active = 1 And
companies.datestamp <= DATE_SUB(SYSDATE(), Interval 14 Day) And
(notices_read.company_id Is Null Or notices_read.company_id != '$company_id')
如果我正確理解您的問題,您只需要使用DATE_SUB
DATE_SUB(SYSDATE(), Interval 14 Day)
完整的查詢將是:
Select
notices.description,
notices.id,
notices.title,
notices_read.company_id,
companies.datestamp
From
notices_read Left Join
notices On notices_read.dismiss_id = notices.id Left Join
companies On notices_read.company_id = companies.id
Where
notices.active = 1 And
companies.datestamp <= DATE_SUB(SYSDATE(), Interval 14 Day) And
(notices_read.company_id Is Null Or notices_read.company_id != '$company_id')
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