How would you extract the display name and URL from a string in the format [display_name](url)? For example: Let’s say for string [abc](https://www.sqlskull.com), how would… Read More »Extract URL and display name from string
A series of SQL most asked interview questions and answers for freshers and experienced professionals will help you prepare and cracking SQL interview. LeetCode –… Read More »SQL Interview Questions
A PRIMARY KEY constraint uniquely identifies each record in a table .
A COMPOSITE KEY is a combination of two or more columns in a table that can be used to uniquely identify each row in the table when the columns are combined uniqueness is guaranteed, but when it taken individually it does not guarantee uniqueness.