SQL is a powerful language that is used to manage data in databases. It can be used for a variety of tasks, including querying data, inserting new records, and updating existing records.
There are many SQL statements that you should know as a developer. You can consult with the Remote DBA administrators.
In this article, we will discuss the top 10 SQL statements that every developer should know.
We will also provide examples of how to use these statements. Let's get started!
SELECT:
The SELECT is mainly used to extract data from a database. It allows you to select specific columns and rows from a table or view.
INSERT:
The INSERT statement is used to insert new records into a table or view. It allows you to specify the values for the new record(s).
UPDATE:
The UPDATE statement is used to update existing records in a table or view. It allows you to specify the values for the updated record(s).
DELETE:
The DELETE statement is used to delete records from a table or view. It allows you to specify the values for the deleted record(s).
WHERE:
The WHERE clause is used to filter data retrieved by the SELECT, UPDATE, and DELETE statements. It allows you to specify the criteria that must be met for data to be returned.
GROUP BY:
The GROUP BY clause is used to group data retrieved by the SELECT statement. It allows you to specify the columns that will be used to group the data.
HAVING:
The HAVING clause is used to filter data that has been grouped by the GROUP BY clause. It allows you to specify the criteria that must be met for data to be included in the group.
JOIN:
If you want to combine data from two or more tables then use the Join clause. It allows you to specify the columns that will be used to join the tables.
ORDER BY:
The ORDER BY clause is used to sort data retrieved by the SELECT statement. It allows you to specify the column(s) that will be used to sort the data.
FAQs:
Q: What is the SELECT statement?
A: The SELECT statement is used to query data from a database. It allows you to select specific columns and rows from a table or view.
Q: What is the INSERT statement?
A: The INSERT statement is used to insert new records into a table or view. It allows you to specify the values for the new record(s).
Q: What is the UPDATE statement?
A: The UPDATE statement is used to update existing records in a table or view. It allows you to specify the values for the updated record(s).
Q: What is the DELETE statement?
A: The DELETE statement is used to delete records from a table or view. It allows you to specify the values for the deleted record(s).
Q: What is the WHERE clause?
A: The WHERE clause is used to filter data retrieved by the SELECT, UPDATE, and DELETE statements. It allows you to specify the criteria that must be met for data to be returned.
Q: What is the GROUP BY clause?
A: The GROUP BY clause is used to group data retrieved by the SELECT statement. It allows you to specify the columns that will be used to group the data.
Q: What is the HAVING clause?
A: The HAVING clause is used to filter data that has been grouped by the GROUP BY clause. It allows you to specify the criteria that must be met for data to be included in the group.
Q: What is the JOIN clause?
A: The JOIN clause is used to combine data from two or more tables. It allows you to specify the columns that will be used to join the tables.
Q: What is the ORDER BY clause?
A: The ORDER BY clause is used to sort data retrieved by the SELECT statement. It allows you to specify the column(s) that will be used to sort the data.
Conclusion:
SQL is a powerful language that is used to manage data in databases. It allows you to query, insert, update, and delete data. It also allows you to filter data by specifying the criteria that must be met. You can also group data and sort it by specifying the column(s) that will be used. In this article, we have introduced you to the basics of SQL. We have also provided some examples of how it can be used.