var query = from t1_row in eprg.AttestationConditions where t1_row.Attestation.ProviderNumber == providerNumber select t1_row.ConditionId;
1.基本查询
from 临时变量 in 集合
where 临时变量的属性==某个值.
select 临时变量.属性/ new 对象{...,...}
2. Join
var query = from a in eprg.AuthRules join t in eprg.ProgramGroup on a.Program_Code equals t.programCode where a.Active.Value == true && a.Svc_Type == serviceTypeCode select new AuthRuleView { CPTCodes = a.CPT_Codes, ServiceGroupId = a.Svc_Group_Id, ProgramGroups = t.Groups, ActionCode = a.Action_Code, RuleMessage = a.Rule_Message };
from 临时变量1 in 集合1
Join 临时变量2 in 集合2
on 临时变量1的属性 equals 临时变量2的属性.
3.Group By