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.
Also question is, 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.
What is column name?
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.
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.
A query is an inquiry into the database using the SELECT statement. A query is used to extract data from the database in a readable format according to the user's request. For instance, if you have an employee table, you might issue a SQL statement that returns the employee who is paid the most.
A database is a collection of information that is organized so that it can be easily accessed, managed and updated. Databases process workloads to create and update themselves, querying the data they contain and running applications against it.
A column or pillar in architecture and structural engineering is a structural element that transmits, through compression, the weight of the structure above to other structural elements below. In other words, a column is a compression member.
In relational databases, and flat file databases, a table is a set of data elements (values) using a model of vertical columns (identifiable by name) and horizontal rows, the cell being the unit where a row and column intersect. A table has a specified number of columns, but can have any number of rows.
(1) On a display screen in character mode, a column is a vertical line of characters extending from the top to the bottom of the screen. The size of a text display is usually measured in rows and columns. (2) In spreadsheets, a column is a vertical row of cells. Spreadsheet columns are usually identified by letters.
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?
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.
In general, an attribute is a characteristic. In a database management system (DBMS), an attribute refers to a database component, such as a table. It also may refer to a database field. Attributes describe the instances in the row of a database.
A table cell is one grouping within a chart table used for storing information or data. Cells are grouped horizontally (rows of cells) and vertically (columns of cells). Each cell contains information relating to the combination of the row and column headings it is collinear with.
A database-management system (DBMS) is a computer-software application that interacts with end-users, other applications, and the database itself to capture and analyze data. A general-purpose DBMS allows the definition, creation, querying, update, and administration of databases.
The DBMS manages incoming data, organizes it, and provides ways for the data to be modified or extracted by users or other programs. Some DBMS examples include MySQL, PostgreSQL, Microsoft Access, SQL Server, FileMaker, Oracle, RDBMS, dBASE, Clipper, and FoxPro.
In the context of databases, cardinality refers to the uniqueness of data values contained in a column. High cardinality means that the column contains a large percentage of totally unique values. Low cardinality means that the column contains a lot of “repeats” in its data range.
You can think of a traditional database as an electronic filing system, organized by fields, records, and files. A field is a single piece of information; a record is one complete set of fields; and a file is a collection of records. For example, a telephone book is analogous to a file.
There are three types of relationships:
- One-to-one: Both tables can have only one record on either side of the relationship.
- One-to-many: The primary key table contains only one record that relates to none, one, or many records in the related table.
Records are composed of fields, each of which contains one item of information. A set of records constitutes a file. For example, a personnel file might contain records that have three fields: a name field, an address field, and a phone number field. In relational database management systems, records are called tuples.
A primary key, also called a primary keyword, is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number (VIN). A relational database must always have one and only one primary key.
A field is single unit of data that is unique within each entry/row, but the overall data category is common to all entries. A database record is, basically, a row that contains unique data in each of the fields. A database will usually contain a large number of records but only a small number of fields.