time:2024-10-17 09:03:10 Gadget Highlights
There are nine types of database objects in a database
Database objects are components of a database, and the common ones are as follows:
1. Table. The table in the database is similar to the table we use in our daily life, it is also made up of rows and columns. Columns are made up of information of the same kind, each column is called a field, and the title of each column is called the field name. Rows contain several columns of information items. A row of data is called a record or a record, and it expresses a meaningful combination of information. A database table consists of one or more records, and a table without records is called an empty table. Each table usually has a primary keyword that uniquely identifies a record.
2. Index. Indexes are built in order based on a specified database table column. It provides quick access to the data and supervises the data in the table so that the data in the columns that its index points to is not duplicated.
3. View. A view looks exactly like a table, with a set of named fields and data items, but it's actually a virtual table that doesn't actually exist in the database. The view is generated by querying the database table, which limits the data that the user can see and modify. Thus, views can be used to control user access to data and simplify the display of data, i.e., to display only those required data information through views.
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