sql+语句研究select u.Id, u.username, (NOW()-u.authenticationTime) as authenticateTimeDifference, u.IP, f.providerId, f.requestId, f.status, u.port from friends f left join users u on u.Id = if ( f.providerId = ".$userId.", f.requestId, f.providerId ) where (f.providerId = ".$us...
select u.Id, u.username, (NOW()-u.authenticationTime) as authenticateTimeDifference, u.IP, f.providerId, f.requestId, f.status, u.port from friends f left join users u on u.Id = if ( f.providerId = ".$userId.", f.requestId, f.providerId ) where (f.providerId = ".$userId." and f.status=".USER_APPROVED.") or f.requestId = ".$userId."
select Id from users where username = '".$username."' limit 1
insert into users(username, pass
, email) values ('".$username."
', '".$password."', '".$email."')
select Id from users where username='".$friendUserName."' limit 1"
insert into friends(providerId, requestId, status) values(".$userId.
", ".$requestId.", ".USER_UNAPPROVED.")
update friends set status = ".USER_APPROVED."where requestId = ".$userId." and providerId in (select Id from users where username in (".$friendNamesQueryPart.")
delete from friends where requestId = ".$userId." and providerId in (select Id from users where username in (".$friendNamesQueryPart.")
select Id from users where username = '".$username."' and password = '".$password."' limit 1
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