Question

按功能分组会引发错误。我该如何解决

Optional<User> user = userRepository.findOne(withOrderd(order).and(withID(id)));

Answer 1

GROUP BY仅需要您要汇总的字段：

GROUP BY TO_CHAR(TRANSBDATE,'MON-YYYY')PERIOD, B.CURCODE

所以不是在COUNT(B.CURCODE)上，而是在CURCODE上

Answer 2

'use strict';

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const {WebhookClient} = require('dialogflow-fulfillment');

admin.initializeApp({
  credential: admin.credential.applicationDefault(),
  databaseURL: 'ws://mood-magic-four-ptwvjb.firebaseio.com/'
});

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });	

  
  
  function playSadSong (agent) {
    // Get the database collection 'dialogflow' and document 'agent'
    var randomNumber = Math.floor(Math.random() * 2) + 1; 
   	return admin.database().ref(('`${randomNumber}`') ).once('value').then((snapshot)  => {
      const song = snapshot.child('song').val();
      const artist = snapshot.child('artist').val();
      
      if(song !== null && snapshot.child('sadness').val() > 0.5){ 
        agent.add(`I will play ${song} by ${artist}`);
      }
      else {
        agent.add(`I couldn't find anything right now...`);
      }
   });
  }
  
    

  // Map from Dialogflow intent names to functions to be run when the intent is matched
  let intentMap = new Map();
  intentMap.set('-Sad - yes', playSadSong);
  
  agent.handleRequest(intentMap);
});

Answer 3

您不能在GROUP BY中包括聚合函数。您只需要SELECT中的未聚合列。

我建议将查询编写为：

SELECT TO_CHAR(H.TRANSBDATE,'MON-YYYY') as PERIOD,
       D.CURCODE,
       COUNT(DISTINCT ?.CUSTOMERID) as UNIQUECUSTOMERS,
       COUNT(*) as TRANS  
FROM FX_TRANSHEADER H JOIN
     FX_TRANSDETAIL D
     ON H.TRANSNO = D.TRANSNO 
WHERE H.TRANSBDATE >= DATE '2018-01-01' AND
      H.TRANSBDATE < DATE '2018-07-01' AND
      ?.C_IDTYPE NOT IN ('CR')
ORDER BY 1 , 4
GROUP BY TO_CHAR(H.TRANSBDATE, 'MON-YYYY');

?用于具有指定列的表的列别名。

注意：

从不在FROM子句中使用逗号。始终使用正确的，明确的，标准 JOIN语法。
使用有意义的表别名（表缩写），而不是任意字母。
使用DATE代表日期文字，因此您的代码不会与服务器上的特定国际化设置相关联。
将BETWEEN替换为两个直接比较。这在Oracle等数据库中尤其重要，其中DATE数据类型具有时间分量。

在SQL中按功能分组

3 个答案: