如何在sql server中使用带有OR子句的IF EXISTS语句

我们需要建立一个script这将insert只有新created offices和districts成Data table.我们需要检查两者Office和District tables新的Records,如果数据存在,我们需要insert它们.

我们试过以下语法,

IF EXISTS (
    SELECT 1
    FROM [dbo].[office] o
    LEFT OUTER JOIN [dbo].[Datatable] a ON (o.OfficeID = a.OfficeID)
    WHERE a.OfficeID IS NULL
)
OR (
IF EXISTS (
    SELECT 1
    FROM [dbo].[District] o
    LEFT OUTER JOIN [dbo].[Datatable] a ON (o.DistrictID = DistrictID)
    WHERE a.DistrictID IS NULL
)
)
BEGIN
   -- //CODE
END

但SSMS给出syntax error了这一点.如何实现上述场景？

它应该是... OR EXISTS(代替OR ( if EXISTS(:

IF EXISTS
 (
     SELECT 1
     FROM [dbo].[office] o
     LEFT OUTER JOIN [dbo].[Datatable] a
        ON (o.OfficeID = a.OfficeID )
     WHERE  a.OfficeID IS NULL
 )
OR EXISTS
 (
     SELECT 1
     FROM [dbo].[District] o
     LEFT OUTER JOIN [dbo].[Datatable] a
        ON (o.DistrictID = DistrictID )
     WHERE  a.DistrictID IS NULL
 ) 
BEGIN
    //CODE
END