Author name: Gajanan vachane

SQL, short for Structured Query Language, is a powerful tool for managing data in databases. If you’re new to SQL, you might wonder: “How do I rename multiple columns at once?” or “Can I modify several columns in SQL?” These questions are common for beginners. In this blog post, we’ll take you through the process […]

Column Name Type tweet_id int content varchar tweet_id is the primary key (column with unique values) for this table. This table contains all the tweets in a social media app. Write a solution to find the IDs of the invalid tweets. The tweet is invalid if the number of characters used in the content of

Table: Views Column Name Type article_id int author_id int viewer_id int view_date date There is no primary key (column with unique values) for this table, the table may have duplicate rows. Each row of this table indicates that some viewer viewed an article (written by some author) on some date.  Note that equal author_id and

1. What is SQL, and what are its primary functions? SQL (Structured Query Language) is a programming language used to manage and manipulate relational databases. Its primary functions include querying data from databases using SELECT, inserting new records using INSERT, modifying existing records using UPDATE, and deleting records using DELETE. 2. Explain the difference between

Table: Customer Column Name Type id int name varchar referee_id int In SQL, id is the primary key column for this table. Each row of this table indicates the id of a customer, their name, and the id of the customer who referred them. Find the names of the customer that are not referred by the customer