|
|
SELECT id, |
user_id, |
status |
FROM people |
|
db.people.find( |
{ }, |
{ user_id: 1, status: 1 } |
) |
|
SELECT user_id, status |
FROM people |
|
db.people.find( |
{ }, |
{ user_id: 1, status: 1, _id: 0 } |
) |
|
SELECT * |
FROM people |
WHERE status = "A" |
|
db.people.find( |
{ status: "A" } |
) |
|
SELECT user_id, status |
FROM people |
WHERE status = "A" |
|
db.people.find( |
{ status: "A" }, |
{ user_id: 1, status: 1, _id: 0 } |
) |
|
SELECT * |
FROM people |
WHERE status != "A" |
|
db.people.find( |
{ status: { $ne: "A" } } |
) |
|
SELECT * |
FROM people |
WHERE status = "A" |
AND age = 50 |
|
db.people.find( |
{ status: "A", |
age: 50 } |
) |
|
SELECT * |
FROM people |
WHERE status = "A" |
OR age = 50 |
|
db.people.find( |
{ $or: [ { status: "A" } , { age: 50 } ] } |
) |
|
SELECT * |
FROM people |
WHERE age > 25 |
|
db.people.find( |
{ age: { $gt: 25 } } |
) |
|
SELECT * |
FROM people |
WHERE age < 25 |
|
db.people.find( |
{ age: { $lt: 25 } } |
) |
|
SELECT * |
FROM people |
WHERE age > 25 |
AND age <= 50 |
|
db.people.find( |
{ age: { $gt: 25, $lte: 50 } } |
) |
|
SELECT * |
FROM people |
WHERE user_id like "%bc%" |
|
db.people.find( { user_id: /bc/ } ) |
-or-
db.people.find( { user_id: { $regex: /bc/ } } ) |
|
SELECT * |
FROM people |
WHERE user_id like "bc%" |
|
db.people.find( { user_id: /^bc/ } ) |
-or-
db.people.find( { user_id: { $regex: /^bc/ } } ) |
|
SELECT * |
FROM people |
WHERE status = "A" |
ORDER BY user_id ASC |
|
db.people.find( { status: "A" } ).sort( { user_id: 1 } ) |
|
SELECT * |
FROM people |
WHERE status = "A" |
ORDER BY user_id DESC |
|
db.people.find( { status: "A" } ).sort( { user_id: -1 } ) |
|
SELECT COUNT(*) |
FROM people |
|
or
|
SELECT COUNT(user_id) |
FROM people |
|
db.people.count( { user_id: { $exists: true } } ) |
or
db.people.find( { user_id: { $exists: true } } ).count() |
|
SELECT COUNT(*) |
FROM people |
WHERE age > 30 |
|
db.people.count( { age: { $gt: 30 } } ) |
or
db.people.find( { age: { $gt: 30 } } ).count() |
|
SELECT DISTINCT(status) |
FROM people |
|
db.people.aggregate( [ { $group : { _id : "$status" } } ] ) |
或者,对于不超过BSON大小限制的不同值集
db.people.distinct( "status" ) |
|
SELECT * |
FROM people |
LIMIT 1 |
|
or
db.people.find().limit(1) |
|
SELECT * |
FROM people |
LIMIT 5 |
SKIP 10 |
|
db.people.find().limit(5).skip(10) |
|
EXPLAIN SELECT * |
FROM people |
WHERE status = "A" |
|
db.people.find( { status: "A" } ).explain() |
|