[英]Distinct statement is used to return only one unique result in one time mysql
有三個表:
tbl住宿桌
-------------- -----------------------
fldProductID fldAccommodationName
-------------- -----------------------
tbl住宿桌
------------- -------------------- ---------------------
fldProductID fldAccommodationText fldAccommodationText1
------------- -------------------- ---------------------
tbl住宿桌
------------ --------
fldProductID seo_url
------------ --------
三表聯接查詢
$sql = "SELECT
DISTINCT
tblAccommodation.fldProductID,
tblAccommodationText.fldAccommodationTextTitle,
seo_url,
tblAccommodation.fldAccommodationName
FROM tblAccommodation
LEFT JOIN tblAccommodationText
ON tblAccommodationText.fldProductID = tblAccommodation.fldProductId
LEFT JOIN tblProduct
ON tblProduct.fldProductID = tblAccommodation.fldProductID
WHERE
seo_url = 'yacht-4'";
代碼結果
------------ ------------------------- ------- -------------------- fldProductID fldAccommodationTextTitle seo_url fldAccommodationName ------------ ------------------------- ------- -------------------- 6 Dolphin Villas yacht-4 yacht 4 upper cabin 6 Aqua Suite yacht-4 Aqua Suite with Pool 6 Dolphin Villas yacht-4 yacht 4 upper cabin 6 Aqua Suite yacht-4 Aqua Suite with Pool
為什么重復兩次相同的值,請幫助我
您可以使用GROUP BY
SELECT tblAccommodation.fldProductID,fldAccommodationText1,tblAccommodationText.fldAccommodationTextTitle,seo_url,tblAccommodation.fldAccommodationName
FROM tblAccommodation
LEFT JOIN tblAccommodationText ON tblAccommodationText.fldProductID = tblAccommodation.fldProductID
LEFT JOIN tblProduct ON tblProduct.fldProductID = tblAccommodation.fldProductID
WHERE seo_url='yacht-4'
GROUP by tblAccommodationText.fldAccommodationTextTitle
代碼首先工作,我刪除了不同的功能,然后按功能分組....
correct query is $sql = "SELECT tblAccommodation.fldProductID,fldAccommodationText1,tblAccommodationText.fldAccommodationTextTitle,seo_url,tblAccommodation.fldAccommodationName FROM tblAccommodation LEFT JOIN tblAccommodationText ON tblAccommodationText.fldProductID = tblAccommodation.fldProductID LEFT JOIN tblProduct ON tblProduct.fldProductID = tblAccommodation.fldProductID where seo_url='yacht-4' GROUP by tblAccommodationText.fldAccommodationTextTitle"
tbl住宿桌
-------------- ----------------------- fldProductID fldAccommodationName -------------- ----------------------- 6 yacht 4 upper cabin 6 Aqua Suite with Pool
tblAccommodationText表
-------------- --------------------- ------------------------ fldProductID fldAccommodationText fldAccommodationText1 -------------- --------------------- ------------------------ 6 Dolphin Villas king sized bed overlooking the ocean... 6 Aqua Suite sundeck with lagoon access where you...
tbl產品表
-------------- -------- fldProductID seo_url -------------- -------- 6 yacht-4 6 yacht-4
預期表
------------ ---------------------------- -------------------- -------- fldProductID fldAccommodationText1 fldAccommodationText seo_url ------------ ----------------------------- -------------------- -------- 6 king sized bed overlooking the ocean... Dolphin Villas yacht-4 6 sundeck with lagoon access where you... Aqua Suite yacht-4
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