19. Which of the following shows One to Many relationship? O A. One user has one set of user settings. One set of user settings is associated with exactly one user. О в. A customers can purchase different products and products can be purchased by different customers. O C. One school can have many phone numbers but a phone number belongs to one school. 20. To declare a primary key go to column, then choose Primary Key. O A. Attributes OB. Null 0 с. Index O D. Type 21. Which among the string data type requires to specify the length the field can hold? OA. VARCHAR О в. BLOB O C. LONGBLOB D. TEXT 22. If Product Code is 78178, it can be declared using the following data type except I. INT II. TINYINT III. BIGINT IV. SMALLINT O A. I AND III O B. II AND IV 0 с. II ONLY O D. II AND III ** H 23. In $x= new mysqli("localhost","root"," ,"student"); What is the username? O A. OB. student 0 с. localhost root
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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