What is a column based database?
A column-oriented DBMS (or columnar database management system) is a database management system (DBMS) that stores data tables by column rather than by row. Practical use of a column store versus a row store differs little in the relational DBMS world.
In the context of a relational database, a row—also called a tuple—represents a single, implicitly structured data item in a table. In simple terms, a database table can be thought of as consisting of rows and columns. Each column expects a data value of a particular type.
- In a relational database, a column is a set of data values of a particular simple type, one value for each row of the database. A column may contain text values, numbers, or even pointers to files in the operating system. A column can also be called an attribute.
- Ideally both are same, and refer to the data values aligned vertically in a table. But when you are talking in terms of database, then you should use Column, not Field. Similarly horizontally aligned data values in a table are known as Rows or Records, but Row or Rows is the correct term in database language.
- vote 3 vote. Whatever its use in mathematics, a tuple in RDBMS is commonly considered to be a row in a table or result set. In an RDBMS a tuple is unordered. A tuple in an MDDBMS is the instance of data in a cell with its associated dimension instances (members). What is the tuple in a column family data store?
Column names. The meaning of a column name depends on its context. A column name can be used to: Declare the name of a column, as in a CREATE TABLE statement. In a GROUP BY or ORDER BY clause, a column name specifies all values in the intermediate result table to which the clause is applied.
- Alternatively, in a table (which i assume you're referring to), rows are 'horizontal' collections of items belonging to a certain category; Columns are 'vertical' collections. Each item (orange) in the table 'belongs' to one row (yellow) and one column (red) well whats the difference between them.
- 1. A column is a vertical series of cells in a chart, table, or spreadsheet. Below is an example of a Microsoft Excel spreadsheet with column headers (column letter) A, B, C, D, E, and F. As you can see from the picture below, column H is the highlighted column in red and the selected cell D8 is in column D.
- The use of table aliases is to rename a table in a specific SQL statement. The renaming is a temporary change and the actual table name does not change in the database. The column aliases are used to rename a table's columns for the purpose of a particular SQL query.
Updated: 2nd October 2019