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What is like in MongoDB?

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What is like in MongoDB?

The MongoDB $regex operator provides such a way to search a string after matching a specified pattern. mongodb uses regular expressions which are more powerful than “LIKE” in SQL. With regular expressions, you can create any pattern that you imagine.

What is operator in MongoDB?

Operators are special symbols or keywords that inform a compiler or an interpreter to carry out mathematical or logical operations. The query operators enhance the functionality of MongoDB by allowing developers to create complex queries to interact with data sets that match their applications.

Is MongoDB like SQL?

SQL databases are used to store structured data while NoSQL databases like MongoDB are used to save unstructured data. MongoDB is used to save unstructured data in JSON format. MongoDB does not support advanced analytics and joins like SQL databases support.

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What is regular expression in MongoDB?

Regular Expressions are frequently used in all languages to search for a pattern or word in any string. MongoDB also provides functionality of regular expression for string pattern matching using the $regex operator. MongoDB uses PCRE (Perl Compatible Regular Expression) as regular expression language.

Where is operator in MongoDB?

The MongoDB $where operator is used to match documents that satisfy a JavaScript expression. A string containing a JavaScript expression or a JavaScript function can be pass using the $where operator. The JavaScript expression or function may be referred as this or obj.

Which of the following is a comparison operator?

Of all the options, options A (=) is the comparison operator in SQL. Comparison operators are used to checking whether two expressions are the same.

What is comparison operator in SQL?

A comparison (or relational) operator is a mathematical symbol which is used to compare two values. Comparison operators are used in conditions that compares one expression with another. The result of a comparison can be TRUE, FALSE, or UNKNOWN (an operator that has one or two NULL expressions returns UNKNOWN).

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Can you use SQL with MongoDB?

MongoDB does not use SQL as a query language. The main reason we went the way we did with the query language – representing queries as JSON – was to normalize the data we are storing with the query mechanism.

What characters are not allowed in MongoDB?

Database names are case-sensitive in MongoDB….Collection names should begin with an underscore or a letter character, and cannot:

  • contain the $ .
  • be an empty string (e.g. “” ).
  • contain the null character.
  • begin with the system. prefix. (Reserved for internal use.)

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