如何从Salesforce SOQL iOS中的1个查询中的两个表中进行选择

Question

如何将salesforce SOQL查询中的这两个请求合并为iOS中的单个请求：

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

使用此子查询：

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