创建一个函数 return a table SQL

Question

我正在为 return 和 SQL 中的 table 创建一个函数，但是，我不知道如何创建该函数，我现在的函数是：

CREATE FUNCTION fn_PegaDetalhesDoPagador (  @IdLoteDet bigint )
RETURNS TABLE 
(
    NomeSacado varchar(60),
    CNPJSacado varchar(20),
    Compromisso varchar(25)
)
AS
RETURN 
(
    SELECT  Sacados.NomeSac, 
        LoteDet.IdLoteDet,
        LoteDet.NossoNum,
        LoteDet.Comprom,
        dbo.Sacados.CNPJ
    FROM    dbo.LoteDet INNER JOIN dbo.Sacados ON dbo.LoteDet.IDSac = dbo.Sacados.IDSac
    WHERE idlotedet=@IdLoteDet

    IF @@ROWCOUNT = 0
        BEGIN
            SELECT  Sacados.NomeSac, 
            LoteDetPg.IdLoteDet,
            LoteDetPg.NossoNum,
            LoteDetPg.Comprom,
            dbo.Sacados.CNPJ
            FROM    dbo.LoteDetPg INNER JOIN dbo.Sacados ON dbo.LoteDetPg.IDSac = dbo.Sacados.IDSac
            WHERE idlotedet=@IdLoteDet
            RETURN
        END
    else
        RETURN
)

我需要什么，如果 select return 没有来自 table LoteDet，我需要的是 table LoteDetPg 中的 select 函数.

使用这种函数可以做到这一点吗？

可以用其他方法做到这一点吗？

Answer 1

首先Select从LoteDetTable获取数据并存储到变量中，如果变量计数不为零，从LoteDet获取数据否则使用LoteDetPgTable获取数据

Answer 2

试试这个：

CREATE FUNCTION fn_PegaDetalhesDoPagador ( @IdLoteDet BIGINT )
RETURNS @res TABLE
(
  NomeSacado VARCHAR(60) ,
  IdLoteDet VARCHAR(MAX) ,--check this cols data type
  NossoNum VARCHAR(MAX) ,--check this cols data type
  Compromisso VARCHAR(25) ,
  CNPJSacado VARCHAR(20)
)
AS
BEGIN
    IF EXISTS ( SELECT TOP 1 Sacados.NomeSac --better if you replace this with PK col
                FROM    dbo.LoteDet
                        INNER JOIN dbo.Sacados ON dbo.LoteDet.IDSac = dbo.Sacados.IDSac
                WHERE   idlotedet = @IdLoteDet )
        BEGIN
            INSERT  INTO @res
                    SELECT  Sacados.NomeSac ,
                            LoteDet.IdLoteDet ,
                            LoteDet.NossoNum ,
                            LoteDet.Comprom ,
                            dbo.Sacados.CNPJ
                    FROM    dbo.LoteDet
                            INNER JOIN dbo.Sacados ON dbo.LoteDet.IDSac = dbo.Sacados.IDSac
                    WHERE   IdLoteDet = @IdLoteDet;
        END;
    ELSE
        BEGIN
            INSERT  INTO @res
                    SELECT  Sacados.NomeSac ,
                            LoteDetPg.IdLoteDet ,
                            LoteDetPg.NossoNum ,
                            LoteDetPg.Comprom ,
                            dbo.Sacados.CNPJ
                    FROM    dbo.LoteDetPg
                            INNER JOIN dbo.Sacados ON dbo.LoteDetPg.IDSac = dbo.Sacados.IDSac
                    WHERE   IdLoteDet = @IdLoteDet;
        END;

    RETURN;
END;

创建一个函数 return a table SQL

Create a function to return a table SQL

sql-server

sql-function