SQL BETWEEN
BETWEEN 关键字用于表达对值范围的查询，就像在 SQL 中一样。 BETWEEN 可用于字符串或数字。在 DocumentDB 中使用 BETWEEN 和 ANSI SQL 的主要区别在于，您可以针对混合类型的属性表达范围查询。
例如，在某些文档中，"等级"可能是一个数字，而在其他文档中，它可能是字符串。在这些情况下，两种不同类型结果之间的比较是"未定义的"，文档将被跳过。
让我们考虑上一个示例中的三个文档。以下是
AndersenFamily 文档。
{
"id": "AndersenFamily",
"lastName": "Andersen",
"parents": [
{ "firstName": "Thomas", "relationship": "father" },
{ "firstName": "Mary Kay", "relationship": "mother" }
],
"children": [
{
"firstName": "Henriette Thaulow",
"gender": "female",
"grade": 5,
"pets": [ { "givenName": "Fluffy", "type": "Rabbit" } ]
}
],
"location": { "state": "WA", "county": "King", "city": "Seattle" },
"isRegistered": true
}
以下是
SmithFamily 文档。
{
"id": "SmithFamily",
"parents": [
{ "familyName": "Smith", "givenName": "James" },
{ "familyName": "Curtis", "givenName": "Helen" }
],
"children": [
{
"givenName": "Michelle",
"gender": "female",
"grade": 1
},
{
"givenName": "John",
"gender": "male",
"grade": 7,
"pets": [
{ "givenName": "Tweetie", "type": "Bird" }
]
}
],
"location": {
"state": "NY",
"county": "Queens",
"city": "Forest Hills"
},
"isRegistered": true
}
以下是
WakefieldFamily 文档。
{
"id": "WakefieldFamily",
"parents": [
{ "familyName": "Wakefield", "givenName": "Robin" },
{ "familyName": "Miller", "givenName": "Ben" }
],
"children": [
{
"familyName": "Merriam",
"givenName": "Jesse",
"gender": "female",
"grade": 6,
"pets": [
{ "givenName": "Charlie Brown", "type": "Dog" },
{ "givenName": "Tiger", "type": "Cat" },
{ "givenName": "Princess", "type": "Cat" }
]
},
{
"familyName": "Miller",
"givenName": "Lisa",
"gender": "female",
"grade": 3,
"pets": [
{ "givenName": "Jake", "type": "Snake" }
]
}
],
"location": { "state": "NY", "county": "Manhattan", "city": "NY" },
"isRegistered": false
}
我们来看一个例子，其中查询返回第一个孩子的成绩在 1-5 之间（包括两者）的所有家庭文档。
以下是使用 BETWEEN 关键字和 AND 逻辑运算符的查询。
SELECT *
FROM Families.children[0] c
WHERE c.grade BETWEEN 1 AND 5
执行上述查询时，会产生以下输出。
[
{
"givenName": "Michelle",
"gender": "female",
"grade": 1
},
{
"firstName": "Henriette Thaulow",
"gender": "female",
"grade": 5,
"pets": [
{
"givenName": "Fluffy",
"type": "Rabbit"
}
]
}
]
要显示上一示例范围之外的成绩，请使用 NOT BETWEEN，如下面的查询所示。
SELECT *
FROM Families.children[0] c
WHERE c.grade NOT BETWEEN 1 AND 5
执行此查询时。它产生以下输出。
[
{
"familyName": "Merriam",
"givenName": "Jesse",
"gender": "female",
"grade": 6,
"pets": [
{
"givenName": "Charlie Brown",
"type": "Dog"
},
{
"givenName": "Tiger",
"type": "Cat"
},
{
"givenName": "Princess",
"type": "Cat"
}
]
}
]
