sqlserver两个数据库联合查询

SELECT  a.Id 医嘱ID ,
        a.MedordType 类目 ,
        a.InhosID 住院号 ,
        a.ExecOfficeID 科室编码 ,
        a.StartTime 开始时间 ,
        c.PatientName 姓名 ,
        d.Office 科室名字
FROM    数据库A.dbo.Mst_LongDoctorAdvice a --LEFT JOIN NEWHISMessageWarning.dbo.MessageWarning b ON 1 = 1
        LEFT JOIN 数据库A.dbo.BaseCom_Patient c ON a.InhosID = c.Diagnoseid
        LEFT JOIN 数据库A.dbo.BaseCom_Office d ON d.Officeid = a.ExecOfficeID
WHERE   a.Id NOT IN ( SELECT    yzID
                      FROM      数据库B.dbo.MessageWarning
                      WHERE     yzlx = 1 );
                      
SELECT  a.Id 医嘱ID ,
        a.MEDORDTYPE 类目 ,
        a.INHOSID 住院号 ,
        a.EXECOFFICEID 科室编码 ,
        a.STARTTIME 开始时间 ,
        c.PatientName 姓名 ,
        d.Office 科室名字
FROM    数据库A.dbo.Mst_TempDoctorAdvice a --LEFT JOIN NEWHISMessageWarning.dbo.MessageWarning b ON 1 = 1
        LEFT JOIN 数据库A.dbo.BaseCom_Patient c ON a.INHOSID = c.Diagnoseid
        LEFT JOIN 数据库A.dbo.BaseCom_Office d ON d.Officeid = a.EXECOFFICEID
WHERE   a.Id NOT IN ( SELECT    yzID
                      FROM      数据库B.dbo.MessageWarning
                      WHERE     yzlx = 2 );