One of the most common operations in SQL is selecting data from a table. In SQL, the SELECT statement is used to retrieve data from one or more tables in a database. The SELECT statement is made up of several clauses that allow you to specify the data you want to retrieve, as well as any filters or sorting you want to apply to the data.
#Selecting Functions
SELECT column1, column2, column3...
FROM table1, table2, table3...
WHERE condition1 AND condition2...
In this statement, you specify the columns you want to retrieve data from after the SELECT keyword, separated by commas. You then specify the name of the table you want to retrieve data from after the FROM keyword. You can also specify a condition that filters the data you want to retrieve using the WHERE clause. Finally, you can sort the data using the ORDER BY clause. You can also use the SELECT statement to perform calculations on the data you retrieve using built-in SQL functions such as AVG(), COUNT(), MIN(), MAX(), and SUM(). These functions can be used to calculate the average, count, minimum, maximum, and sum of data in a column.
Basic String Operations Exercise Solution
#Code Completed
CREATE TABLE students (name text, grade int);
INSERT INTO students VALUES ("Eric", 83);
INSERT INTO students VALUES ("John", 78);
INSERT INTO students VALUES ("Andrew", 91);
INSERT INTO students VALUES ("Jessica", 95);
INSERT INTO students VALUES ("Chris", 79);
SELECT name FROM students WHERE grade > 80;
In summary, the SELECT statement is a fundamental part of SQL that allows you to retrieve data from one or more tables in a database. By using the various clauses and functions available in the SELECT statement, you can filter, sort, and perform calculations on data to retrieve the information you need.
