如何获取SQL查询以进入列的JSON,并找到整个列中子字符串的实例数?
我正在使用SQL Server 2016。
即
FruitPageTable
[Id, PageData (nvarchar(max))]
[1 , [{"id":"0","Url":"/i-like-apples/ok-cool"}, {"id":"1","Url":"/where-are-apples/nowhere"} ]
[2 , [{"id":"0","Url":"/where-are-oranges/everywhere"}]
[3 , [{"id":"0","Url":"/where-are-apples/somewhere"}]
[4 , [{"id":"0","Url":"/apples"},{"id":"1","Url":"/yay-apples"},{"id":"2","Url":"/apples"}]
所以
SELECT COUNT(*)
FROM FruitPageTable
WHERE [PageData] LIKE '%apples%'
给我3 ...即包含'apples'的记录数量。
但是如何在所有记录中的Url
中的JSON中的PageData
属性中获取“苹果”的数量?即总共6次提及。我应该使用JSON_QUERY语法吗?
我认为您不需要json_query
即可检查'apples'
,string
和mathematical
功能的数量。
select
sum(round((length(val) - length(replace(val, 'apples', '')))/length('apples'))) AS count
from
MySQLTable
请参见dbfiddle
sqlserver,使用openjson
select count(1) from
MySQLTable t1
cross apply openjson(t1.val)
with (
url varchar(200) '$.Url'
) as i
where url like '%apples%'
请参见sqlfiddle