如何在SQL Server 2008中使用子查询从表中获取数据？

Question

我正在尝试使用子查询从表中获取数据，但出现此错误：

基表：[tblPriscription]

[Priscriptionid] [bigint] IDENTITY(1,1) NOT NULL,
[patientId] [bigint] NULL,
[doctorId] [bigint] NULL,
[BillNo]  AS ([Priscriptionid]+(100)),
[BillDate] [datetime] NULL,
[BillType] [nvarchar](50) NULL,
[PaymentBy] [nvarchar](50) NULL,
[DocumentType] [nvarchar](50) NULL,
[DocumentName] [nvarchar](50) NULL,
[bitIsActive] [bit] NULL,
[dateCreated] [date] NULL,
[bitIsDelete] [bit] NULL,
[bitisSave] [bit] NULL,
[TotalAmount] [decimal](18, 2) NULL,

我要从中获取数据的表：

dbo.tblPriscriptionDetail

[PriscriptionDtlid] [bigint] IDENTITY(1,1) NOT NULL,
[Priscriptionid] [bigint] NULL,
[drugId] [bigint] NULL,
[Rxno] [bigint] NULL,
[sigId] [bigint] NULL,
[Selling] [decimal](18, 2) NULL,
[Qty] [int] NULL,
[RefillQty] [int] NULL,
[RefillNo] [int] NULL,
[Days] [int] NULL,
[Amount] [decimal](18, 2) NULL,
[bitIsActive] [bit] NULL,
[dateCreated] [datetime] NULL,
[bitIsDelete] [bit] NULL,
[PurchaseDtlid] [bigint] NULL,
[bitIsSave] [bit] NULL,
[BillType] [nvarchar](50) NULL,
[PaymentBy] [nvarchar](50) NULL,
[patientId] [bigint] NULL,
[id] [bigint] NULL,

Qyery：

SELECT *,
       (SELECT insuranceName
        FROM   tblinsurance
        WHERE  insuranceid = (SELECT insuranceid
                              FROM   tblpatient
                              WHERE  PatientId = tblPriscription.PatientId))            AS insuranceName,
       (SELECT drfirstname + ' ' + drlastname
        FROM   tbldoctor
        WHERE  doctorid = tblPriscription.doctorid)                                     AS doctorname,
       (SELECT patFirstName + ' ' + patLastName
        FROM   tblPatient
        WHERE  patientid = tblPriscription.patientid)                                   AS patname,
       (SELECT policyno
        FROM   tblPatient
        WHERE  patientid = tblPriscription.patientid)                                   AS policyno,
       (SELECT insuranceplanname
        FROM   tblInsurancePlan
        WHERE  insuranceplanid = (SELECT insuranceplanid
                                  FROM   tblpatient
                                  WHERE  PatientId = tblPriscription.PatientId))        AS insurancePlanName,
       (SELECT drugname
        FROM   tblDrugMaster
        WHERE  drugid = (SELECT drugid
                         FROM   tblPriscriptionDetail
                         WHERE  priscriptionid = tblPriscriptionDetail.priscriptionid)) AS drugname,
       (SELECT qty
        FROM   tblPriscriptionDetail
        WHERE  priscriptionid = tblPriscriptionDetail.priscriptionid)                   AS qty,
       (SELECT Selling
        FROM   tblPriscriptionDetail
        WHERE  priscriptionid = tblPriscriptionDetail.priscriptionid)                   AS selling
FROM   tblPriscription 

我正在尝试从tblPriscriptionDetail药名，数量和销售中获取数据，建议我如何做

Answer 1

您只需要加入而不凌乱的子查询。

  SELECT tp.*, tpd.qty, tpd.Selling, ti.insuranceName
    FROM tblPriscription tp inner join tblPriscriptionDetail tpd ON tpd.Priscriptionid = tp.Priscriptionid 
inner join tblinsurance ti ON ti.insuranceid  = tp.PatientId
inner join your other tables

Answer 2

JOIN是要走的路，但是要提防INNER JOIN，除非您确定每种情况下总是有匹配的记录-如果没有，则使用LEFT JOIN 。 如果您确定INNER JOIN不会丢失行，请尝试执行此操作

SELECT Selling, qty, drugname, insuranceplanname, policyno, patFirstName + ' ' + patLastName AS patname, drfirstname + ' ' + drlastname AS doctorname, insuranceName
FROM tblPrescription P
INNER JOIN tblPrescriptionDetail PD ON PD.PrescriptionID = P.PrescriptionID
INNER JOIN tblDrugMaster DM ON DM.PrescriptionID = PD.PrescriptionID
INNER JOIN tblPatient PP ON PP.PatientID = P.PatientID
INNER JOIN tblInsurancePlan IP ON IP.InsuranceplanID = P.InsuranceplanID
INNER JOIN tblDoctor D ON D.DoctorID = P.DoctorID
INNER JOIN tblInsurance I ON I.InsuranceID = P.InsuranceID

我试图在大小写上引入一些一致性，并且将您要提取的所有字段都包含在原始字段中（而不只是您想要的字段）。 我很好奇您同时拥有tblInsurance和tblInsurancePlan。