Elite QandA


What is a projection database?


  1. What is a projection database?
  2. What is a projection query?
  3. What is the use of projection in SQL?
  4. What is the difference between selection and projection in SQL?
  5. What is projection in mysql?
  6. What is the difference between projecting and joining?

What is a projection database?

In relational terminology, projection is defined as taking a vertical subset from the columns of a single table that retains the unique rows. The result contains the same number of rows as the customer table, but it projects only a subset of the columns in the table.

What is a projection query?

Projection queries allow you to query Datastore for just those specific properties of an entity that you actually need, at lower latency and cost than retrieving the entire entity. Projection queries are similar to SQL queries of the form: SELECT name, email, phone FROM CUSTOMER.

What is the use of projection in SQL?

Projection: A project operation selects only certain columns (fields) from a table. The result table has a subset of the available columns and can include anything from a single column to all available columns.

What is the difference between selection and projection in SQL?

Exactly. Projection means choosing which columns (or expressions) the query shall return. Selection means which rows are to be returned.

What is projection in mysql?

Projection means choosing which columns (or expressions) the query shall return. Selection means which rows are to be returned. if the query is. select a, b, c from foobar where x=3, then "a, b, c" is the projection part, "where x=3" the selection part.

What is the difference between projecting and joining?

What is the difference between projecting and joining? Projecting is manipulating data to ELIMINATE columns in a table, while joining is manipulating data to COMBINE two or more tables.



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