sql - ASP.Net WEB 应用程序转移到另一台计算机

Question

我有一张桌子作为付款

ser. paymentdate amount
1.   12 mar 2007 5000
1.   14 mar 2007 5000
2.   6 dec 2007  4000
3.   2 mar 2008  6000
4.   5 nov 2008  2000

我想按月从表组中选择数据，例如 2007 年的记录

month    amount
mar      10000
dec      4000

我可以通过此查询获取数据日期，但不能获取月份数据。

Answer 1

请试试：

SELECT 
    DATENAME(m, paymentdate) [Month], 
    SUM(Amount) AS Amount
FROM 
    Payment
WHERE
    YEAR(paymentdate)=2007
GROUP BY DATENAME(m, paymentdate), MONTH(paymentdate)
ORDER BY MONTH(paymentdate)

Answer 2

SQL LIKE 子句用于使用通配符将值与相似值进行比较。有两个通配符与 LIKE 运算符一起使用：

The percent sign (%)
The underscore (_)

百分号表示零个、一个或多个字符。下划线表示单个数字或字符。这些符号可以组合使用。

WHERE SALARY LIKE '%200%'   

查找在任何位置具有 200 的任何值

因此，根据您的情况，取一些包含您要选择的月份的变量，然后输入类似的语句，

WHERE SALARYDATE LIKE '%mar%'

或其他一些适合您的选择

WHERE SALARY LIKE '200%'    Finds any values that start with 200
WHERE SALARY LIKE '%200%'   Finds any values that have 200 in any position
WHERE SALARY LIKE '_00%'    Finds any values that have 00 in the second and third positions
WHERE SALARY LIKE '2_%_%'   Finds any values that start with 2 and are at least 3 characters in length
WHERE SALARY LIKE '%2'  Finds any values that end with 2
WHERE SALARY LIKE '_2%3'    Finds any values that have a 2 in the second position and end with a 3
WHERE SALARY LIKE '2___3'   Finds any values in a five-digit number that start with 2 and end with 3