lter table product so that column productlype is an integer instead of a varchar, not null should be maintained. Alter table product so that column productType is a foreign key to table productType, column id Alter table customer so that column zipCode is a foreign key to table çityState. column zipCode Alter table customer to drop column city and state Alter table employee so that column zipCode is a foreign key to table çityState. column zipCode Alter table employee to drop column city and state Alter table supplier so that column zipCode is a foreign key to table çityState, column zipCode Alter table supplier to drop column city and state
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.
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