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Introduction To SQL
SQL stands for Structured Query Language. SQL is used to create, remove, alter the database and database objects in a database management system and to store, retrieve, update the data in a database. SQL is a standard language for creating, accessing, manipulating database management system. SQL works for all modern relational database management systems, like SQL Server, Oracle, MySQL, etc.
- It is a standard language for Relational Database System. It enables a user to create, read, update and delete relational databases and tables.
- All the RDBMS like MySQL, Informix, Oracle, MS Access and SQL Server use SQL as their standard database language.
- SQL allows users to query the database in a number of ways, using English-like statements.
Link for the Problem – Print Prime Numbers SQL – Hacker Rank Solution
Print Prime Numbers SQL – Hacker Rank Solution
Problem:
Write a query to print all prime numbers less than or equal to 1000. Print your result on a single line, and use the ampersand (&) character as your separator (instead of a space).
For example, the output for all prime numbers would be:
2&3&5&7
Print Prime Numbers SQL – Hacker Rank Solution
SELECT GROUP_CONCAT(NUMB SEPARATOR '&') FROM ( SELECT @num:=@num+1 as NUMB FROM information_schema.tables t1, information_schema.tables t2, (SELECT @num:=1) tmp ) tempNum WHERE NUMB<=1000 AND NOT EXISTS( SELECT * FROM ( SELECT @nu:=@nu+1 as NUMA FROM information_schema.tables t1, information_schema.tables t2, (SELECT @nu:=1) tmp1 LIMIT 1000 ) tatata WHERE FLOOR(NUMB/NUMA)=(NUMB/NUMA) AND NUMA<NUMB AND NUMA>1 )