sqlserver 字符串日期比较大小

select top 20 *from sp_goodscontent
 where LEN(goodsId)>3 and buyNow is not null 
and giftArray='好单库'
--and goodsId='560969552229'
order by CREATE_date DESC

select count(1) from sp_goodscontent
 where  buyNow is null 
and giftArray='好单库'

select count(1) from sp_goodscontent
 where   giftArray='好单库'
and buyNow is not null

select  *from sp_goodscontent
 where LEN(goodsId)>3 and buyNow is null 
--and giftArray='好单库'
and len(goodsClick)<9
order by CREATE_date DESC

DELETE from sp_goodscontent
 where LEN(goodsId)>3 and buyNow is null 
--and giftArray='好单库'
and len(goodsClick)<9

--update sp_goodscontent set isbook=0 where isbook=1
SELECT * FROM sp_goodscontent where isbook=1

SELECT CONVERT(date ,coupon_end_time,23) from sp_goodscontent  where coupon_end_time LIKE '20%'


SELECT * from sp_goodscontent where coupon_end_time <>''


SELECT coupon_end_time from sp_goodscontent where coupon_end_time LIKE '20%'
AND DATEDIFF(SECOND,'2019-07-15',CONVERT(date ,coupon_end_time,23))>1