Test your basic knowledge |

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Not equal query conditional. ex: db.<col>.find({numVal: {$ne:3}});






2. Data structure used to store all other data in mongo databases.






3. Operator used in the second argument of the find() call to specify which slice of an array to return for an array field.






4. ...






5. set of UTF-8 characters.






6. Copies an entire database from one name on one server to another name on another server. Omit frmHostName to copy from one name to another on the same server.






7. Deletes documents from the collection based on the selector.






8. Returns one document matching the optional properties.






9. String of arbitrary bytes.






10. Unique 12-byte ID for documents.






11. The local variable representation of a query. Uniquely - the cursor does not hold the results but instead access to the results.






12. Meta query conditional generating a modulus with the selector operand. Checks to see if the field value when divided by one value has the remainder of the second value.






13. Used to represent both a null value and a nonexistent field.






14. Adds a document to a collection.






15. Update modifier that set the value of a key and if the key does not exist, it will create the key. ex: db.<col>.update({selector},{"$set":{"someKey":"someValue"}});






16. Update call that inserts a new document if no update match is found. Allows the same code to be used for inserts as well as updates.






17. Less than or equal query conditional. ex: db.<col>.find({numVal: {$lte:3}});






18. Command to get help docs on a specific command at the collection level.






19. Operator allowing the partial specification of fields in an embedded document in an array.






20. Not supported by the javascript shell and are converted to 64-bit floating point numbers.






21. changes the database on which you are working.






22. Adds a document to a collection.






23. Creates an index on property(s). Options can describe the type of sorting, uniqueness, etc.






24. The standard number representation in the javascript shell.






25. Binary-encoded serialization of mongo documents.






26. Updates all matching documents, not just the first, that match the selector.






27. Contains query conditional used to check if a value contains the field value.






28. Update modifier used to increment a value. ex: {"$inc":{"counter":2}}






29. Standard javascript regular expressions. These can be stored in documents






30. command to start the mongo shell.






31. Command to get help docs on a specific command at the db level.






32. Set or list of values.






33. Adds a value to the array only if its not in the array already. Otherwise, if the field is not present, it sets the field to the array value. ex: { $addToSet : { a : { $each : [ 3 , 5 , 6 ] } } }






34. Removes an element from an array based on the value of the field option being 1 or -1 for last or first element respectively. ex: { $pop : { field : -1 } }






35. Query conditional allowing the selector to choose between more than one optional criteria.






36. Greater than query conditional. ex: db.<col>.find({numVal: {$gt:3}});






37. Returns help information for a command.






38. Operator allowing the execution of arbitrary javascript as part of the selector.






39. Used to describe a variable as not having been initialized.






40. Deletes documents from the collection based on the selector.






41. Stored as milliseconds since the epoch.






42. Appends each value in the value_array to the field - if field is an existing array. Otherwise - it sets the field to the array value_array - if field is not present ex: { $pushAll : { field : value_array } }






43. Returns the size of a document after it is converted to BSON from the JSON-like original.






44. Less than query conditional. ex: db.<col>.find({numVal: {$lt:3}});






45. command to start the mongodb process.






46. Returns all the documents matching the optional properties.






47. Array specific conditional used to select based on the length or set-size of an array field value.






48. Array specific conditional allowing matching on multiple elements within an array. The operation is non strict on the sequence of the values in the passed selector array.






49. Syntax used for selectors to be specific to a certain element position within an array.






50. Renames a field from the one indicated to the new field name. ex: { $rename : { old_field_name : new_field_name } }