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A database dump contains a record of the table structure and/or the data from a database and is usually in the form of a list of SQL statements ("SQL dump"). A database dump is most often used for backing up a database so that its contents can be restored in the event of data loss. Corrupted databases can often be recovered by analysis of the dump.
To SELECT one row of data from a table called tab with a primary key column (pk) set to 100 — use the condition pk = 100: SELECT * FROM tab WHERE pk = 100 To identify whether a table tab has rows of data with a duplicated column dk — use the condition having count(*) > 1 :
Referential integrity is a property of data stating that all its references are valid. In the context of relational databases, it requires that if a value of one attribute (column) of a relation (table) references a value of another attribute (either in the same or a different relation), then the referenced value must exist. [1]
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Edward Pettifer, 31, was one of 14 victims in the New Year's Day truck attack in New Orleans. / Credit: Met Police Pettifer is believed to be the stepson of Prince William and Prince Harry's ...
According to Bloomberg data, of the more than 60 analysts covering Apple on Wall Street, only four have sell or sell-equivalent ratings. Shares of Apple traded down about 1% to $242.43 in Tuesday ...
Columns of any conceivable data type (from string types and numeric types to array types and table types) are then acceptable in a 1NF table—although perhaps not always desirable; for example, it may be more desirable to separate a Customer Name column into two separate columns as First Name, Surname.
2 1/2 lb. sweet Vidalia onions (3 large or 4 medium), peeled Arrange a rack in center of oven; preheat to 350°. Lightly grease a 13” x 9” baking dish with cooking spray. Arrange an onion on ...