SQL
SELECT Statements
|
MongoDB
find() Statements
|
SELECT *
FROM users
|
db.users.find()
|
SELECT id,
user_id,
status
FROM users
|
db.users.find(
{
},
{ user_id: 1, status: 1 }
)
|
SELECT user_id, status
FROM users
|
db.users.find(
{
},
{ user_id: 1, status: 1, _id: 0 }
)
|
SELECT *
FROM users
WHERE status = "A"
|
db.users.find(
{ status: "A" }
)
|
SELECT user_id, status
FROM users
WHERE status = "A"
|
db.users.find(
{ status: "A" },
{ user_id: 1, status: 1, _id: 0 }
)
|
SELECT *
FROM users
WHERE status != "A"
|
db.users.find(
{ status: { $ne: "A" } }
)
|
SELECT *
FROM users
WHERE status = "A"
AND age = 50
|
db.users.find(
{ status: "A",
age: 50 }
)
|
SELECT *
FROM users
WHERE status = "A"
OR age = 50
|
db.users.find(
{ $or: [ { status: "A" } ,
{ age: 50 } ] }
)
|
SELECT *
FROM users
WHERE age > 25
|
db.users.find(
{ age: { $gt: 25 } }
)
|
SELECT *
FROM users
WHERE age < 25
|
db.users.find(
{ age: { $lt: 25 } }
)
|
SELECT *
FROM users
WHERE age > 25
AND age <= 50
|
db.users.find(
{ age: { $gt: 25, $lte: 50 } }
)
|
SELECT *
FROM users
WHERE user_id like "%bc%"
|
db.users.find( { user_id: /bc/ } )
|
SELECT *
FROM users
WHERE user_id like "bc%"
|
db.users.find( { user_id: /^bc/ } )
|
SELECT *
FROM users
WHERE status = "A"
ORDER BY user_id ASC
|
db.users.find( { status: "A" } ).sort( { user_id: 1 } )
|
SELECT *
FROM users
WHERE status = "A"
ORDER BY user_id DESC
|
db.users.find( { status: "A" } ).sort( { user_id: -1 } )
|
SELECT COUNT(*)
FROM users
|
db.users.count()
or
db.users.find().count()
|
SELECT COUNT(user_id)
FROM users
|
db.users.count( { user_id: { $exists: true } } )
or
db.users.find( { user_id: { $exists: true } } ).count()
|
SELECT COUNT(*)
FROM users
WHERE age > 30
|
db.users.count( { age: { $gt: 30 } } )
or
db.users.find( { age: { $gt: 30 } } ).count()
|
SELECT DISTINCT(status)
FROM users
|
db.users.distinct( "status" )
|
SELECT *
FROM users
LIMIT 1
|
db.users.findOne()
or
db.users.find().limit(1)
|
SELECT *
FROM users
LIMIT 5
SKIP 10
|
db.users.find().limit(5).skip(10)
|
EXPLAIN SELECT *
FROM users
WHERE status = "A"
|
db.users.find( { status: "A" } ).explain()
|
For more information, see db.collection.find(), db.collection.distinct(),db.collection.findOne(), $ne $and, $or, $gt, $lt, $exists, $lte, $regex, limit(),skip(), explain(), sort(),
and count().
Update Records
The following table
presents the various SQL statements related to updating existing records in
tables and the corresponding MongoDB statements.
SQL
Update Statements
|
MongoDB
update() Statements
|
UPDATE users
SET status = "C"
WHERE age > 25
|
db.users.update(
{ age: { $gt: 25 } },
{ $set: { status: "C" } },
{ multi: true }
)
|
UPDATE users
SET age = age + 3
WHERE status = "A"
|
db.users.update(
{ status: "A" } ,
{ $inc: { age: 3 } },
{ multi: true }
)
|
Delete Records
The following table
presents the various SQL statements related to deleting records from tables and
the corresponding MongoDB statements.
SQL
Delete Statements
|
MongoDB
remove() Statements
|
DELETE FROM users
WHERE status = "D"
|
db.users.remove( { status: "D" } )
|
DELETE FROM users
|
db.users.remove({})
|
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