我想从本月获得最新记录

Question

我有一张表，可以为商店分配预算。

我想从当前月份获得所有商店的记录，因为我写的查询是：

SELECT * FROM table_budget WHERE store IN ([$STORE$]) AND MONTH(Date) = MONTH(CURRENT_DATE())
            AND YEAR(Date) = YEAR(CURRENT_DATE());

但如果商店本月有两个或两个以上的预算，我想获得最新记录。

Answer 1

将此添加到查询的末尾：

AND NOT EXISTS
(
    SELECT * FROM table_budget t2 
    WHERE t2.Store=table_budget.Store and t2.Date>table_budget.Date
)

Answer 2

自我加入获取每家商店的最新记录

SELECT 
  a.* 
FROM
  table_budget a 
  LEFT JOIN table_budget b 
    ON a.store = b.store 
    AND a.Date < b.Date 
WHERE a.store IN ([ $STORE$ ]) 
  AND MONTH(a.Date) = MONTH(CURRENT_DATE()) 
  AND YEAR(a.Date) = YEAR(CURRENT_DATE()) 
  AND b.store IS NULL ;

Answer 3

您也可以尝试使用 LAST 功能，但并非所有应用程序都支持

因此，如前所述，解决方法解决方案是使用 ORDER BY ，然后使用 DESC 。 如果您只想要最后一条记录，请添加 LIMIT

e.g。 SELECT column_name FROM table_name ORDER BY column_name DESC 限制1;

Answer 4

试试这个：

SELECT * FROM table_budget WHERE store IN ([$STORE$]) AND MONTH(Date) = MONTH(CURRENT_DATE())
AND YEAR(Date) = YEAR(CURRENT_DATE()) ORDER BY Date DESC
LIMIT 1;