What would be the result of the SQL statement CREATE UNIQUE INDEX idxA ON TabA(A), if the column A is not a candidate key?
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What would be the result of the SQL statement CREATE UNIQUE INDEX idxA ON TabA(A), if the column A is not a candidate key?
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- In Sql These are some database from a set of tables insert into AccountHolder(AccountID, CustomerID, AccountType)values (55003, 115, 'Savings'),(44001, 101, 'Chequing'),(55006, 109, 'Savings'),(44002, 102, 'Chequing'),(44003, 113, 'Chequing'),(55007, 108, 'Savings'),(44004, 103, 'Chequing'),(44005, 110, 'Chequing'),(55005, 112, 'Savings'),(44006, 114, 'Chequing'),(55001, 111, 'Savings'),(44007, 107, 'Chequing'),(44008, 104, 'Chequing'),(55004, 106, 'Savings'),(44009, 105, 'Chequing'),(44010, 113, 'Chequing'),(55002, 107, 'Savings'),(44011, 110, 'Chequing'),(44012, 104, 'Chequing') select * from AccountHolder insert into Branch(LocationID, BranchName, Address, Type, DepositSum, LoanSum)values (1, 'Boulevard Branch', '3268 Wade Boulevard', 'Rural', 171848.88, 37681.72),(2, 'Avenue Branch', '4814 Dare Avenue', 'Rural', 232707.42, 68324.56),(3, 'Street Branch', '208 Ferry Street', 'Commercial', 375010.75, 44665.08),(4, 'Road Branch', '468 Zulauf Road', 'Commercial', 496001.41,…Explain how referential integrity is established in databases that are SQL:1999 compliant. Explain how the ON UPDATE RESTRICT, ON UPDATE CASCADE, and ON UPDATE SET NULL clauses differ from one another. What happens if the ON DELETE CASCADE clause is set?How does the SQL ORDER BY clause work, and why might it be important when using database functions like MAX() or MIN()? Provide a query illustrating its usage.
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- A select operation in a relational database is used to reduce the size of a table by deleting columns that meet particular requirements.Is this true or false?Give an Example of Oracle PL/SQL stored procedure?In a relational database, a select operation is used to delete columns that satisfy specific criteria, hence reducing the size of a table.Is this statement accurate?