Question

会员表：

 ID Resident    Gender      Location

1   Steve       M       S-55
2   Roger       M       S-42
3   Martha      F       R-20
4   Samantha    F       CC
5   Tom         M       S-12

我正在尝试编写一个返回单个数值的SQL语句。

有些事情：

SELECT COUNT(Gender) 
FROM Members
WHERE GENDER = M 
   AND Location CONTAINS 'S%'

在AND LOCATION语法中SQL显然不存在MALE，但我希望得到proton | Mar 02, 2016 11:46:47 AM com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader readFrom proton | INFO: started event message body reader proton | Mar 02, 2016 11:46:47 AM com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader readFrom proton | INFO: Event: NodeContextUpdate proton | Mar 02, 2016 11:46:47 AM com.ibm.hrl.proton.webapp.providers.EventXmlNgsiMessageReader readFrom proton | SEVERE: Could not parse XML NGSI event java.lang.NullPointerException, reason: null proton | last attribute name: null last value: null成员数量并驻留在某个位置的数量那里有一个S。

这可能吗？

Answer 1

SELECT COUNT(*)
FROM   Members
WHERE  GENDER = 'M'
AND    Location LIKE '%S%'

Answer 2

SELECT COUNT(*) as count
FROM Members
WHERE GENDER = 'M' AND Location LIKE 'S%'

是否可以在SQL中执行此操作？

2 个答案: