Sort and projection

14 sort And projection

// When querying documents , The default in accordance with the id Values 
db.emp.find({});

//sort Used to specify the collation of documents 
db.emp.find({}).sort({sal:1});

// Descending 
db.emp.find({}).sort({sal:-1});

db.emp.find({}).sort({sal:1,empno:-1});

// When inquiring , You can set the query result at the second parameter , Projection 
db.emp.find({},{ename:1,_id=0,sal=1});

limit/skip/sort The calling order is independent of the writing order .