Create a trigger on WORKS_ON, if a new tuple with Hours=NULL is inserted, set the Hours to 0. 6. Create a table with attributes SSN, dependent_name and ChangeTimeStamp, whenever a new tuple is inserted into DEPENDENT table, record the operation using a trigger. 7. Create a trigger on CLIENT, whenever a tuple is deleted, delete all the tuples in PROJECT table and WORKS_ON table with the same Pno as the deleted tuple from CLIENT. 8. Create a trigger on EMPLOYEE, whenever a new employee is inserted, if the employee has salary higher than his/her supervisor, set the employee's salary to NULL.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
5. Create a trigger on WORKS_ON, if a new tuple with Hours=NULL is inserted, set the Hours to 0.
6. Create a table with attributes SSN, dependent_name and ChangeTimeStamp, whenever a new tuple is inserted into DEPENDENT table, record the operation using a trigger.
7. Create a trigger on CLIENT, whenever a tuple is deleted, delete all the tuples in PROJECT table and WORKS_ON table with the same Pno as the deleted tuple from CLIENT.
8. Create a trigger on EMPLOYEE, whenever a new employee is inserted, if the employee has salary higher than his/her supervisor, set the employee's salary to NULL.
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