如何从两个表1个查询在Salesforce SOQL iOS的选择

Question

我怎样才能在Salesforce SOQL查询合并这两请求转换成1个单个请求在iOS设备上：

NSString *theRequest = [NSString stringWithFormat:@"SELECT Name, OpportunityID FROM OpportunityLineItem where OpportunityID = '%@'", [companyDic objectForKey:@"Id"]]; 
SFRestRequest *request = [[SFRestAPI sharedInstance] requestForQuery:theRequest]; 
[[SFRestAPI sharedInstance] send:request delegate:self]; 

和

NSString *theRequest2 = [NSString stringWithFormat:@"SELECT CompetitorName FROM OpportunityCompetitor where OpportunityID = '%@'", [companyDic objectForKey:@"Id"]]; 
SFRestRequest *request2 = [[SFRestAPI sharedInstance] requestForQuery:theRequest2]; 
[[SFRestAPI sharedInstance] send:request2 delegate:self]; 

Answer 1

使用此子查询：

SELECT Name, OpportunityID FROM OpportunityLineItem where OpportunityID IN (SELECT OpportunityID FROM OpportunityCompetitor where OpportunityID = '%@')