SQL, or Structured Query Language, is a programming language used to manage and manipulate data in relational databases. If you’re new to SQL, the first step is to learn how to write and execute basic SQL queries. The “Hello, World!” program is a simple program that is often used as a starting point for learning a new programming language.
# Creates a table called helloworld, with one column called Phrase and can contain text.
CREATE TABLE helloworld (phrase TEXT);
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In SQL, the equivalent of the “Hello, World!” program is a basic SELECT statement. The SELECT statement is used to retrieve data from a database. In its simplest form, a SELECT statement consists of the keyword SELECT, followed by a list of columns to retrieve data from, and the keyword FROM, followed by the name of the table containing the data.
# Adding two rows to the table.
CREATE TABLE helloworld (phrase TEXT);
INSERT INTO helloworld VALUES ("Hello, World!");
INSERT INTO helloworld VALUES ("Goodbye, World!");
SELECT COUNT(*) FROM helloworld;
The asterisk (*) is a wildcard character that indicates all columns should be retrieved. This statement would return all rows and columns from the “customers” table. If you only wanted to retrieve specific columns, you would list them instead of using the asterisk.
# Selecting data from the table
SELECT * FROM helloworld WHERE phrase = "Hello, World!";
For example, to retrieve just the “first_name” and “last_name” columns from the “customers” table, the SELECT statement would be used. In conclusion, the “Hello, World!” equivalent in SQL is a basic SELECT statement. Understanding how to write and execute basic SQL queries is an essential first step in learning SQL. Once you have a grasp of the basics, you can move on to more complex queries and database operations.
