我在要查询的列（“数据”）中具有以下JSON格式的数据： 记录1：
{
"actions":[
{
"class":"Action",
"entries":[
{
"class":"Entry",
"id":null,
"key":"StartTime",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560858977855,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"O",
"value":"\"2019-06-17T11:58:38.000Z\""
},
{
"class":"Entry",
"id":null,
"key":"StartedBy",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560858977855,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"C_R",
"value":"1019"
}
]
}
]
}
记录2：
{
"actions":[
{
"class":"Action",
"entries":[
{
"class":"Entry",
"id":null,
"key":"StartTime",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560863293329,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"O",
"value":null
},
{
"class":"Entry",
"id":null,
"key":"StopTime",
"performance":{
"class":"com.bma.common.dto.Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560863293329,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"O",
"value":"\"2019-06-18T13:08:42.000Z\""
},
{
"class":"Entry",
"id":null,
"key":"StartedBy",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560858977855,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e6"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"C_R",
"value":"1018"
}
]
}
]
}
现在我需要确定的是每个开始时间是否都有停止时间，以便确定是否还有任何正在进行的操作。请注意，第一个记录没有带有StopTime键的对象。也有没有StartTime键的记录。并且，请参见记录2，带有StartTime键的对象可以具有空值。具有StopTime键的对象也是如此。我炮制了以下尚未完成的sql：
SELECT ca1.[value] AS StartTimeCol,
ca2.[value] AS StopTimeCol
FROM queriedTable qu
CROSS APPLY OPENJSON(qu.Data, '$.actions')
WITH (
entries nvarchar(max) '$.entries' AS JSON
) j
CROSS APPLY OPENJSON(j.entries)
WITH (
[key] nvarchar(100) '$.key',
[value] nvarchar(100) '$.value'
) ca1
CROSS APPLY OPENJSON(j.entries)
WITH (
[key] nvarchar(100) '$.key',
[value] nvarchar(100) '$.value'
) ca2
WHERE
ca1.[key] = 'StartTime' OR
ca2.[key] = 'StopTime'
很显然，我已经开始计算StartTimes和StopTimes了；让我感到困惑的是，尽管我明确指出仅必须考虑键StartTime和StopTime，但结果却在其他对象（例如“ 1019”和“ 1018”）的StartTimeCol和StopTimeCol列中给出了我的值。怎么来的？并且如何在一个查询中确定StopTimes的数量是否大于或等于StartTimes的数量？
谢谢！
答案 0 :(得分：0)
如果我正确理解了您的问题，那么下一种方法可能会有所帮助：
表格：
CREATE TABLE queriedTable (
Data nvarchar(max)
)
INSERT INTO queriedTable
(Data)
VALUES
(N'{
"actions":[
{
"class":"Action",
"entries":[
{
"class":"Entry",
"id":null,
"key":"StartTime",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560858977855,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"O",
"value":"\"2019-06-17T11:58:38.000Z\""
},
{
"class":"Entry",
"id":null,
"key":"StartedBy",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560858977855,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"C_R",
"value":"1019"
}
]
}
]
}'
),
(N'{
"actions":[
{
"class":"Action",
"entries":[
{
"class":"Entry",
"id":null,
"key":"StartTime",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560863293329,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"O",
"value":null
},
{
"class":"Entry",
"id":null,
"key":"StopTime",
"performance":{
"class":"com.bma.common.dto.Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560863293329,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e7"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"O",
"value":"\"2019-06-18T13:08:42.000Z\""
},
{
"class":"Entry",
"id":null,
"key":"StartedBy",
"performance":{
"class":"Performance",
"origin":null,
"originUuid":null,
"performanceDateTime":1560858977855,
"performerUuid":{
"class":"java.util.UUID",
"UUID":"2647a005-a3a8-4362-8f2d-ddd188f500e6"
},
"registrationDateTime":null,
"userUuid":null
},
"type":"C_R",
"value":"1018"
}
]
}
]
}')
T-SQL：
SELECT
RANK() OVER (ORDER BY qu.Data) Rn,
COUNT(*) OVER (PARTITION BY qu.Data) [Count],
b.*
FROM queriedTable qu
CROSS APPLY OPENJSON(qu.Data, '$.actions') WITH (
Data nvarchar(max) '$.entries' AS JSON
) a
CROSS APPLY OPENJSON(a.Data) WITH (
[key] nvarchar(max) '$.key',
[value] nvarchar(max) '$.value'
) b
WHERE b.[key] = 'StartTime' OR b.[key] = 'StopTime'
输出：
Rn Count key value
1 1 StartTime "2019-06-17T11:58:38.000Z"
2 2 StartTime
2 2 StopTime "2019-06-18T13:08:42.000Z"