查詢與工會，加入和限制（沒有工作）

我堅持了一個問題，我請大家幫忙查詢與工會，加入和限制（沒有工作）

sql = mysqli_query($con, " 


SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_0 
INNER JOIN komentarebi 
ON portfeli_0.piadi=komentarebi.person_id 
WHERE portfeli_0.user='$user' 

UNION ALL 
SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_1 
INNER JOIN komentarebi 
ON portfeli_1.piadi=komentarebi.person_id 
WHERE portfeli_1.user='$user' 

");

在komentarebi

我有同樣爲person_id多個記錄，我必須把其中只有1是否有可能？

來源

2016-06-13 David P

這看起來並不像SQL服務器？ MySQL不等於sql-server。 – Chuck

對於每1行_limit加入（限制不起作用）_，至少對於我來說並不十分清楚。我最初的想法是嘗試將'SELECT'改爲'SELECT DISTINCT's;但不知道更多關於您的數據... – Uueerdo

您正在獲取重複的行？然後使用'UNION'而不是'UNION ALL'，這樣重複的東西就被刪除了。如果你要求別的東西向我們展示例子：來自兩個表格的一些行，你得到的結果和你想要的結果。 –

這樣的限制應該工作

(SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_0 
INNER JOIN komentarebi 
ON portfeli_0.piadi=komentarebi.person_id 
WHERE portfeli_0.user='$user' 
LIMIT 1) 

UNION ALL 
(SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_1 
INNER JOIN komentarebi 
ON portfeli_1.piadi=komentarebi.person_id 
WHERE portfeli_1.user='$user' 
LIMIT 1)

來源

2016-06-13 19:50:57 scaisEdge

試試這個

(SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_0 
INNER JOIN komentarebi 
ON portfeli_0.piadi=komentarebi.person_id 
WHERE portfeli_0.user='$user' 
LIMIT 1) 

UNION 

(SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_1 
INNER JOIN komentarebi 
ON portfeli_1.piadi=komentarebi.person_id 
WHERE portfeli_1.user='$user' 
LIMIT 1)

來源

2016-06-13 20:21:43

在komentarebi我有相同的person_id多個記錄，我必須只採取其中一個是否有可能？ –

如果您有重複行，請使用UNION而不是UNION ALL將其刪除：

SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_0 INNER JOIN 
    komentarebi 
    ON portfeli_0.piadi=komentarebi.person_id 
WHERE portfeli_0.user = '$user' 

UNION 

SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM portfeli_1 INNER JOIN 
    komentarebi 
    ON portfeli_1.piadi=komentarebi.person_id 
WHERE portfeli_1.user = '$user' ;

你可以如果您只希望返回一行，請在查詢結尾添加限制。

來源

2016-06-13 21:07:59

如果在兩個表中都有同一用戶的記錄，那麼postdate可能會不同並且使用UNION而不是UNION ALL不會解決問題（因爲any difference in any of the columns意味着行根據嚴格定義不重複這個詞的，所以union或select distinct不會刪除它們）

所以不是我建議你選擇與最新的日期行：

SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
FROM (
    SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
    FROM portfeli_0 
    INNER JOIN komentarebi 
    ON portfeli_0.piadi=komentarebi.person_id 
    WHERE portfeli_0.user='$user' 

    UNION ALL 
    SELECT piadi, debtorfullName, ClientAddress, mobilePhone, principalAmount, totalAmount, status, product_name,comment ,postdate 
    FROM portfeli_1 
    INNER JOIN komentarebi 
    ON portfeli_1.piadi=komentarebi.person_id 
    WHERE portfeli_1.user='$user' 
    ) 
ORDER BY postdate DESC 
LIMIT 1

來源

2016-06-13 21:23:16

查詢與工會，加入和限制（沒有工作）

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