MySql to mongo

SQL SELECT StatementsMongoDB find() Statements
SELECT * FROM people db.people.find()
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 db.people.count() or db.people.find().count()
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” } } ] ) or, for distinct value sets that do not exceed the BSON size limit db.people.distinct( “status” )
SELECT * FROM people LIMIT 1 db.people.findOne() 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()

About the author

Janaki(http://mjanaki.com) - A Software developer with 9+ years of experience in multiple technology projects across web, mobile, and cloud applications with expertise in PHP, C#, MySQL, Web services and open source platforms.

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