4. Write the business rules against the following E-R diagram. movie_cast act_id mov_id integer integer char (30) actor genres Y act_id act_fname act_Iname act_gender integer char (20) char (20) char (1) Y gen_id integer char (20) role gen_title movie mov_id mov_title mov_year mov_time mov_lang mov_dt_rel mov_rel_country char (5) integer char (50) integer integer char (50) date director movie_genres 9 dir_id integer char (20) char (20) mov_id integer integer dir_fname gen_id dir_Iname rating integer mov_id rev_id reviewer movie_direction integer char (30) integer integer num o_ratings integer dir_id integer rev_id rev_stars mov_id integer rev_name 81 81 81 81 81

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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.