Question

我有多个查询，只在一列中生成一个计数（仅一个单元格）。我需要将这些列组合在一起。

假设查询是：

select count (*) from address where city = NULL as citycount;
select count (*)  from address where countrycode = 4 as countrycount;
select count (*) from address;

以上查询将返回结果：

citycount

40

countrycount

50

count(*)

400045

我希望以这种方式组合上述查询，以便结果为：

 citycount countrycount  count(*)

    40        50          400045

这意味着列将合并。我有30多个查询。提前致谢

Answer 1

将SUM与CASE表达式一起使用：

 select 
    sum(case when city = NULL then 1 else 0 end ) as citycount,
    sum(case when countrycode=4 then 1 else 0 end ) as countrycount,
    count(*) as countt
    from address

Answer 2

select 
(select count (*) from address where city IS NULL) as citycount,
(select count (*) from address where countrycode = 4) as countrycount,
count(*)
from address

Answer 3

尝试这样的事情......希望有所帮助

module.exports.uploadToAWS = function uploadToAWS(folderName, fileName, fileData) {

  var s3 = new AWS.S3({ params: {Bucket: ‘myBucket’} });

  var keyName = folderName + "/" + fileName;

  var buffer = new Buffer(fileData.replace(/^data:image\/\w+;base64,/, ""),'base64')

  var data = {
    Key: keyName, 
    Body: buffer,
    ContentEncoding: 'base64',
    ContentType: 'image/jpeg'
  };

  s3.putObject(data, function(err, data) {
    if (err) { 
      console.log(err);
      console.log('Error uploading data: ', data); 
    } else {
      console.log('succesfully uploaded the image!');
    }
  });
}

单独在多个列中组合多个sql查询的结果

3 个答案: