Question

说我有一个带值

的TABLE

1,2,2,3,4和ALL

在SAME专栏

中

然后我

SELECT DISTINCT

value

FROM table

我如何始终选择＆＃39; All＆＃39; 1号？

或至少命令它＆＃39;所有＆＃39;是第1名。

注意：该列是VARCHAR（x）

修改

SELECT DISTINCT
Strategy
FROM @Strategy
ORDER BY case when Strategy = 'All' then 0 else 1 end, 
Strategy DESC

这是我目前的查询

Answer 1

您为每个问题选择了正确的关键字（DISTINCT）和正确的表达式（ORDER BY CASE WHEN ... END）。诀窍是逐个解决问题，而不是一次。

SELECT *
FROM 
(
    SELECT DISTINCT T1.*
    FROM (VALUES ('1'), ('2'), ('2'), ('3'), ('4'), ('ALL')) AS T1(Strategy)
) AS T2
ORDER BY CASE WHEN Strategy = 'ALL' THEN 0 ELSE 1 END, Strategy;

Answer 2

在这种情况下，只需使用：

void

Answer 3

您可以使用NSURLSession（而不是NSMutableURLRequest *request =[[NSMutableURLRequest alloc] initWithURL:requestURL]; NSLog(@"fetchAPromotionWithType = %@", requestURL); [request setHTTPMethod:@"GET"]; NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler: ^(NSData *data, NSURLResponse *response, NSError *error) { dispatch_async(dispatch_get_main_queue(), ^{ NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response; int responseStatusCode = (int)[httpResponse statusCode]; if ( responseStatusCode == OK_RESPONSE_CODE || responseStatusCode == CREATED_RESPONSE_CODE || responseStatusCode == ACCEPTED_RESPONSE_CODE || responseStatusCode == PARTIAL_RESPONSE_CODE) { if (data) { NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]; NSLog(@"Data->%@",dict); if (dict != nil && [dict isKindOfClass:[NSDictionary class]]) { NSDictionary *dataDict = [dict objectForKey:@"data"]; if (dataDict != nil && [dataDict isKindOfClass:[NSDictionary class]]) { //Get your success Data } } } } else { if (responseStatusCode == 0) { NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"No Connection! Please try again.", @"message", nil]; //Get Your Fail Data } else if (data) { // NSArray *tempArray = @[@"fan", @"vungle"]; //[JLSharedData sharedManager].savedWaterfallInterstitialArray = nil; //testing NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]; //Get Your Fail Data } } }); }]; [task resume]; }];）与@jarlh建议的上述评论中的GROUP BY条款（稍微调整一下）。

DISTINCT

或者继续使用ORDER BY，您可以将SELECT Strategy FROM @Strategy GROUP BY Strategy ORDER BY CASE WHEN Strategy = 'All' THEN 0 ELSE Strategy END语句移动到DISTINCT子句，以创建要在CASE子句中使用的新列：

SELECT

或者，如果后续项目的顺序无关紧要，请按照@ChrisChurch的建议保持简单。

Answer 4

请试一试。

Declare @table table (id varchar(max))

Insert into @table values ('1'),('2'),('2'),('All'),('3'),('4')

select * from @table

--select * from @table order by id 

select * from @table order by case when id = 'All' then 0 else id end

另一个转折，假设您有2个varchar条目仍然是这个逻辑工作

Declare @table table (id varchar(max))

Insert into @table values ('1'),('2'),('2'),('All'),('3'),('4'),('Select')

select * from @table

select * from @table order by id 

select * from @table order by case when id in ( 'All' , 'Select') then 0 else id end

如何始终选择某个值1st sql

4 个答案: