使用控制台提取数据
使用 SQL 命令提取数据
可以使用 SQL SELECT 语句从 NoSQL 表中提取数据。
从表中提取所有行
可以从表中选择列。为此，请在语句的 SELECT 后面列出所需表列的名称。在 FROM 子句后指定了表的名称。要从子表中检索数据，请使用点表示法，例如 parent.child 。要选择所有表列，请使用星号 (*) 通配符。SELECT 语句还可以包含基于现有列值的计算表达式。
示例 1：从表
BaggageInfo 中选择所有数据。SELECT * FROM BaggageInfo解释：BaggageInfo 方案具有一些固定的静态字段和 JSON 列。静态字段包括票证号码、全名、性别、联系人电话和确认号码。包信息以 JSON 格式存储，并填充文档数组。
输出（为了简洁起见，仅显示结果行）：
{"ticketNo":1762330498104,"fullName":"Michelle Payne","gender":"F","contactPhone":"575-781-6240","confNo":"RL3J4Q",
"bagInfo":[{
"bagArrivalDate":"2019-02-02T23:59:00Z",
"flightLegs":[
{"actions":[
{"actionAt":"SFO","actionCode":"ONLOAD to IST","actionTime":"2019-02-02T12:10:00Z"},
{"actionAt":"SFO","actionCode":"BagTag Scan at SFO","actionTime":"2019-02-02T11:47:00Z"},
{"actionAt":"SFO","actionCode":"Checkin at SFO","actionTime":"2019-02-02T10:01:00Z"}],
"estimatedArrival":"2019-02-03T01:00:00Z",
"flightDate":"2019-02-02T12:00:00Z",
"flightNo":"BM318",
"fltRouteDest":"IST",
"fltRouteSrc":"SFO"},
{"actions":[
{"actionAt":"IST","actionCode":"ONLOAD to ATH","actionTime":"2019-02-03T13:06:00Z"},
{"actionAt":"IST","actionCode":"BagTag Scan at IST","actionTime":"2019-02-03T12:48:00Z"},
{"actionAt":"IST","actionCode":"OFFLOAD from IST","actionTime":"2019-02-03T13:00:00Z"}],
"estimatedArrival":"2019-02-03T12:12:00Z",
"flightDate":"2019-02-02T13:10:00Z",
"flightNo":"BM696",
"fltRouteDest":"ATH",
"fltRouteSrc":"IST"},
{"actions":[
{"actionAt":"JTR","actionCode":"Offload to Carousel at JTR","actionTime":"2019-02-03T00:06:00Z"},
{"actionAt":"ATH","actionCode":"ONLOAD to JTR","actionTime":"2019-02-03T00:13:00Z"},
{"actionAt":"ATH","actionCode":"OFFLOAD from ATH","actionTime":"2019-02-03T00:10:00Z"}],
"estimatedArrival":"2019-02-03T00:12:00Z",
"flightDate":"2019-2-2T12:10:00Z",
"flightNo":"BM665",
"fltRouteDest":"JTR",
"fltRouteSrc":"ATH"}],
"id":"79039899186259",
"lastActionCode":"OFFLOAD",
"lastActionDesc":"OFFLOAD",
"lastSeenStation":"JTR",
"lastSeenTimeGmt":"2019-02-02T23:59:00Z",
"routing":"SFO/IST/ATH/JTR",
"tagNum":"17657806247861"}
]}示例 2：要从表
BaggageInfo 中选择特定列，请将列名作为逗号分隔的列表包含在 SELECT 语句中。SELECT fullName, contactPhone, gender FROM BaggageInfo解释：要显示三个静态字段的值：全名、电话号码和性别。
输出：
{"fullName":"Lucinda Beckman","contactPhone":"364-610-4444","gender":"M"}
{"fullName":"Adelaide Willard","contactPhone":"421-272-8082","gender":"M"}
{"fullName":"Raymond Griffin","contactPhone":"567-710-9972","gender":"F"}
{"fullName":"Elane Lemons","contactPhone":"600-918-8404","gender":"F"}
{"fullName":"Zina Christenson","contactPhone":"987-210-3029","gender":"M"}
{"fullName":"Zulema Martindale","contactPhone":"666-302-0028","gender":"F"}
{"fullName":"Dierdre Amador","contactPhone":"165-742-5715","gender":"M"}
{"fullName":"Henry Jenkins","contactPhone":"960-428-3843","gender":"F"}
{"fullName":"Rosalia Triplett","contactPhone":"368-769-5636","gender":"F"}
{"fullName":"Lorenzo Phil","contactPhone":"364-610-4444","gender":"M"}
{"fullName":"Gerard Greene","contactPhone":"395-837-3772","gender":"M"}
{"fullName":"Adam Phillips","contactPhone":"893-324-1064","gender":"M"}
{"fullName":"Doris Martin","contactPhone":"289-564-3497","gender":"F"}
{"fullName":"Joanne Diaz","contactPhone":"334-679-5105","gender":"F"}
{"fullName":"Omar Harvey","contactPhone":"978-191-8550","gender":"F"}
{"fullName":"Fallon Clements","contactPhone":"849-731-1334","gender":"M"}
{"fullName":"Lisbeth Wampler","contactPhone":"796-709-9501","gender":"M"}
{"fullName":"Teena Colley","contactPhone":"539-097-5220","gender":"M"}
{"fullName":"Michelle Payne","contactPhone":"575-781-6240","gender":"F"}
{"fullName":"Mary Watson","contactPhone":"131-183-0560","gender":"F"}
{"fullName":"Kendal Biddle","contactPhone":"619-956-8760","gender":"F"}示例 3：从表
stream_acct 中选择所有数据。SELECT * FROM stream_acct解释：stream_acct 方案具有一些固定的静态字段和 JSON 列。
输出（为了简洁起见，仅显示结果行）：
{"acct_id":1,"profile_name":"AP","account_expiry":"2023-10-18T00:00:00.0Z",
"acct_data":{
[{
"showName": "At the Ranch",
"showId": 26,
"showtype": "tvseries",
"genres": ["action", "crime", "spanish"],
"numSeasons": 4,
"seriesInfo": [{
"seasonNum": 1,
"numEpisodes": 2,
"episodes": [{
"episodeID": 20,
"episodeName": "Season 1 episode 1",
"lengthMin": 85,
"minWatched": 85,
"date": "2022-04-18"
},
{
"episodeID": 30,
"lengthMin": 60,
"episodeName": "Season 1 episode 2",
"minWatched": 60,
"date": "2022 - 04 - 18 "
}]
},
{
"seasonNum": 2,
"numEpisodes": 2,
"episodes": [{
"episodeID": 40,
"episodeName": "Season 2 episode 1",
"lengthMin": 50,
"minWatched": 50,
"date": "2022-04-25"
},
{
"episodeID": 50,
"episodeName": "Season 2 episode 2",
"lengthMin": 45,
"minWatched": 30,
"date": "2022-04-27"
}]
},
{
"seasonNum": 3,
"numEpisodes": 2,
"episodes": [{
"episodeID": 60,
"episodeName": "Season 3 episode 1",
"lengthMin": 50,
"minWatched": 50,
"date": "2022-04-25"
},
{
"episodeID": 70,
"episodeName": "Season 3 episode 2",
"lengthMin": 45,
"minWatched": 30,
"date": "2022 - 04 - 27 "
}]
}]
},
{
"showName": "Bienvenu",
"showId": 15,
"showtype": "tvseries",
"genres": ["comedy", "french"],
"numSeasons": 2,
"seriesInfo": [{
"seasonNum": 1,
"numEpisodes": 2,
"episodes": [{
"episodeID": 20,
"episodeName": "Bonjour",
"lengthMin": 45,
"minWatched": 45,
"date": "2022-03-07"
},
{
"episodeID": 30,
"episodeName": "Merci",
"lengthMin": 42,
"minWatched": 42,
"date": "2022-03-08"
}]
}]
}]}}从表中过滤数据
可以通过在 WHERE 子句中指定筛选条件来筛选查询结果。通常，筛选条件由一个或多个通过逻辑运算符 AND 或 OR 连接的比较表达式组成。还支持下列比较运算符：=、！=、>、>=、< 和 <= 。
示例 1：查找乘客行李的标签号以及给定预订编号 FH7G1W 的乘客全名。
SELECT bag.fullName, bag.bagInfo[].tagNum FROM BaggageInfo bag
WHERE bag.confNo="FH7G1W"解释：您可以提取与给定保留编号对应的标记编号。
输出：
{"fullName":"Rosalia Triplett","tagNum":"17657806215913"}注意：
为了更好地了解，下面显示了包含所有静态字段和 bagInfo JSON 的数据行。"ticketNo" : 1762344493810,
"fullName" : "Adam Phillips",
"gender" : "M",
"contactPhone" : "893-324-1064",
"confNo" : "LE6J4Z",
[ {
"id" : "79039899165297",
"tagNum" : "17657806255240",
"routing" : "MIA/LAX/MEL",
"lastActionCode" : "OFFLOAD",
"lastActionDesc" : "OFFLOAD",
"lastSeenStation" : "MEL",
"flightLegs" : [ {
"flightNo" : "BM604",
"flightDate" : "2019-02-01T01:00:00",
"fltRouteSrc" : "MIA",
"fltRouteDest" : "LAX",
"estimatedArrival" : "2019-02-01T03:00:00",
"actions" : [ {
"actionAt" : "MIA",
"actionCode" : "ONLOAD to LAX",
"actionTime" : "2019-02-01T01:13:00"
}, {
"actionAt" : "MIA",
"actionCode" : "BagTag Scan at MIA",
"actionTime" : "2019-02-01T00:47:00"
}, {
"actionAt" : "MIA",
"actionCode" : "Checkin at MIA",
"actionTime" : "2019-02-01T23:38:00"
} ]
}, {
"flightNo" : "BM667",
"flightDate" : "2019-01-31T22:13:00",
"fltRouteSrc" : "LAX",
"fltRouteDest" : "MEL",
"estimatedArrival" : "2019-02-02T03:15:00",
"actions" : [ {
"actionAt" : "MEL",
"actionCode" : "Offload to Carousel at MEL",
"actionTime" : "2019-02-02T03:15:00"
}, {
"actionAt" : "LAX",
"actionCode" : "ONLOAD to MEL",
"actionTime" : "2019-02-01T07:35:00"
}, {
"actionAt" : "LAX",
"actionCode" : "OFFLOAD from LAX",
"actionTime" : "2019-02-01T07:18:00"
} ]
} ],
"lastSeenTimeGmt" : "2019-02-02T03:13:00",
"bagArrivalDate" : "2019.02.02T03:13:00"
} ]示例 2：上次看到预订编号为 FH7G1W 的行李在何处？此外，获取行李的标签号。
SELECT bag.fullName, bag.bagInfo[].tagNum,bag.bagInfo[].lastSeenStation
FROM BaggageInfo bag WHERE bag.confNo="FH7G1W"解释：bagInfo 是 JSON，并且填充了文档数组。可以提取特定保留编号的全名和最后一个看到的站。
输出：
{"fullName":"Rosalia Triplett","tagNum":"17657806215913",
"lastSeenStation":"VIE"}示例 3：为票号为 1762340579411 的乘客选择行李（标记和上次查看时间）的详细信息。
SELECT bag.ticketNo, bag.fullName, bag.bagInfo[].tagNum,bag.bagInfo[].lastSeenStation
FROM BaggageInfo bag where bag.ticketNo=1762320369957解释：bagInfo 是 JSON，并且填充了文档数组。可以为特定票证编号提取全名、标记编号和上次看到的站。
输出：
{"fullName":"Lorenzo Phil","tagNum":["17657806240001","17657806340001"],
"lastSeenStation":["JTR","JTR"]}示例 4：获取姓氏、帐户到期日期以及用户使用
acct_id 1 观看的节目。SELECT account_expiry, acct.acct_data.lastName, acct.acct_data.contentStreamed[].showName FROM stream_acct acct WHERE acct_id=1解释：acct_data 是 JSON，并且填充了文档数组。提取特定账户 ID 的姓氏、账户到期日期和显示名称。
输出：
{"account_expiry":"2023-10-18T00:00:00.0Z","lastName":"Phillips","showName":["At the Ranch","Bienvenu"]}