047_SOQL 基本查询总结

 User currentUser = [SELECT Id, Profile.Name,UserRole.Name FROM User WHERE Id = :UserInfo.getUserId()];

在子记录中查询父记录

实例1:

Project__c pro = [SELECT Id, Name, Account__r.Name, P_Status__c, P_Plan_Complete_Date__c, P_Actual_Complete_Date__c
                          FROM Project__c
                          WHERE P_Status__c='Finishing'
                                          LIMIT 1];

其中Account为自定义的关系字段，Project为自定义的对象

实例2:

Opportunity opp = [select Name, Account.Name from Opportunity limit 1];

2、在父记录中查询相关的子记录

Account acc = [select name, (select name from opportunities) from account limit 1];
system.debug('account name:' + acc.name);
List opp = acc.opportunities;
system.debug('number of opportunities:' + opp.size());
for (opportunity op : opp) {
    system.debug('opportunity name:' + op.name);
}

3、从junction对象里，查询与之master-details关系的两个details记录

数据模型图如下：


查询需求：查询会议名称日期及与之相关的发言人姓名。

SELECT Session__r.Name,
       Session__r.Session_Date__c,
       Speaker__r.First_Name__c,
       Speaker__r.Last_Name__c
FROM Session_Speaker__c
ORDER BY Session__r.Session_Date__c,
         Session__r.Name

示例：

1-1 、下面查询返回与Closed Won的商机相关的Account的Id和Name：

SELECT Id, Name FROM Account
WHERE Id IN
  ( SELECT AccountId
    FROM Opportunity
    WHERE StageName = 'Closed Won'
  )

1-2、下面查询返回联系人来源于Web的商机Id

SELECT Id FROM Opportunity
WHERE AccountId NOT IN
  (
    SELECT AccountId
    FROM Contact
    WHERE LeadSource = 'Web'
  )

1-3、下面查询返回与Closed Won商机且与LeadSource为Web的联系人相关的Account的Id和Name

SELECT Id, Name, Owner.UserName  FROM Account
WHERE Id IN (SELECT AccountId FROM Contact WHERE LeadSource = 'Web')
      AND Id IN (SELECT Accountid FROM Opportunity WHERE StageName = 'Prospecting')

1-4、在查询语句中使用 [ORDER BY fieldOrderByList {ASC|DESC} [NULLS {FIRST|LAST}] ]
未使用Example：

SELECT Tender_Project__r.Name, Bid_Amount__c, Is_Finalists_Competitive__c, Bid_Price_Fomula__c, Supplier_Bid_Price__c, Bidding_Ranking__c, CreatedDate
FROM Advertiser_Tender_Relationship__c
WHERE Tender_Project__c = 'a0L7F000000JyMk' <span style="color:#ff0000;">ORDER BY Bidding_Ranking__c ASC</span>

效果预览：

使用后Example：

SELECT Tender_Project__r.Name, Bid_Amount__c, Is_Finalists_Competitive__c, Bid_Price_Fomula__c, Supplier_Bid_Price__c, Bidding_Ranking__c, CreatedDate
FROM Advertiser_Tender_Relationship__c
WHERE Tender_Project__c = 'a0L7F000000JyMk' <span style="color:#ff0000;">ORDER BY Bidding_Ranking__c ASC NULLS LAST</span>