如何在Salesforce SOQL iOS中的1個查詢中從兩個表中選擇

Question

我如何將Salesforce SOQL查詢中的這兩個請求合並為iOS中的1個單個請求：

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

使用此子查詢：

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