Write a SQL statement that inserts these three records to the three tables.

A select operation in a relational database decreases the size of a table by removing columns that fulfill certain criteria.Is this statement truthful or false?

PostgreSql differs from the SQL Standard primarily by requiring which of these constructs. a. reference to either the old row or new row b. begin and end c. stored trigger function d. trigger credentials

A select operation in a relational database decreases the size of a table by removing columns that fulfill certain criteria.Is this statement truthful or false?

Write a PL/SQL Programming block to do below actions 2.Before you work on Quesiton 2 , please create a table because you will be inserting numbers in thisMessages tableCREATE TABLE messages( RESULTS NUMBER)Run below query to see if there is any data :SELECT * FROM MESSAGES

A select operation in a relational database reduces the size of a table by removing columns that meet particular criteria.Is this true or false?

- Create a trigger that will insert new emp_no, salary, from_date and to_date into salaries table after a new employee record is inserted. Assume the new employee salary is 10000 and from_date is current date and to_date is "9999年01月01日" - List the employees’ first names and salaries where their salary is above the average salary among the employees

My other instruction for SQL says: Create and test a stored procedure called checkin_transaction that processes a "checkin" transaction. When a book is checked in, the corresponding CHECKOUT record is updated to show the date it was checked in, and the Pat_ID attribute in the BOOK table is updated to NULL. The entire transaction (starting with START TRANSACTION; and ending with COMMIT;) should be in between the BEGIN and END statements of the stored procedure. You should be able to call the procedure with a statement like this, passing the values of the Book_Num, Pat_ID, and Check_In_Date to the procedure: CALL checkin_transaction(5243, 1170, ‘2017年04月30日’) Do you guys know how?

When working with a relational database, a select operation may be used to reduce the amount of space used by a table by removing columns that meet certain requirements.Is this the right answer or the wrong answer?

Need help writing SQL statements for these, I'm getting some errors for my returns.