insert into 和 where not exists

https://social.msdn.microsoft.com/Forums/sqlserver/en-US/3569bd60-1299-4fe4-bfa1-d77ffa3e579f/insert-into-with-not-exists?forum=transactsql

错误的语法

INSERT INTO [dbo].[geo_asso_type]

([geo_asso_type_id]

,[bound_asso_type]

,[updated_date])

VALUES

(11

,'Province to City'

,GETDATE()

WHERE NOT EXISTS

(SELECT 1 FROM [dbo].[geo_asso_type] WHERE [geo_asso_type_id] = 11)

方案1，前置not exists

IF NOT EXISTS (SELECT 1 FROM [dbo].[geo_asso_type] WHERE [geo_asso_type_id] = 11)
BEGIN
    INSERT INTO [dbo].[geo_asso_type]
        ([geo_asso_type_id]
        ,[bound_asso_type]
        ,[updated_date])
    VALUES
        (11
        ,'Province to City'
        ,GETDATE())  

END 

方案2，通过select的方式插入数据

INSERT INTO [dbo].[geo_asso_type]
(
[geo_asso_type_id],
[bound_asso_type],
[updated_date]
)
SELECT
     11,
     'Province to City',
     GETDATE()
WHERE NOT EXISTS(
    SELECT 1
    FROM [dbo].[geo_asso_type]
    WHERE [geo_asso_type_id] = 11
)