What are the different SQL statements used to create, read, update, and delete data?

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What are the different SQL statements used to create, read, update, and delete data?

Alejandro Penzini Answered question October 30, 2023
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The different SQL statements used to create, read, update, and delete data are as follows:

Create:

CREATE TABLE
Read:

SELECT
Update:

UPDATE
Delete:

DELETE
Here is a brief overview of each statement:

CREATE TABLE:

The CREATE TABLE statement is used to create a new table in a database. The syntax for the CREATE TABLE statement is as follows:

SQL
CREATE TABLE table_name (
column_name1 data_type1,
column_name2 data_type2,
...
);
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The table_name is the name of the new table. The column_name1, column_name2, and so on are the names of the columns in the new table. The data_type1, data_type2, and so on are the data types of the columns in the new table.

For example, the following CREATE TABLE statement would create a new table called employees with two columns: id and name:

SQL
CREATE TABLE employees (
id INT,
name VARCHAR(255)
);
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SELECT:

The SELECT statement is used to retrieve data from a database. The syntax for the SELECT statement is as follows:

SQL
SELECT column_name1, column_name2, ...
FROM table_name
WHERE condition;
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The column_name1, column_name2, and so on are the names of the columns that you want to retrieve data from. The table_name is the name of the table that you want to retrieve data from. The WHERE clause is optional and can be used to filter the results of the query.

For example, the following SELECT statement would retrieve the names of all employees:

SQL
SELECT name
FROM employees;
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UPDATE:

The UPDATE statement is used to update data in a database. The syntax for the UPDATE statement is as follows:

SQL
UPDATE table_name
SET column_name1 = new_value1, column_name2 = new_value2, ...
WHERE condition;
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The table_name is the name of the table that you want to update data in. The SET clause is used to specify the columns that you want to update and the new values that you want to set them to. The WHERE clause is optional and can be used to filter the rows that are updated.

For example, the following UPDATE statement would update the salary of the employee with the ID of 1:

SQL
UPDATE employees
SET salary = 100000
WHERE id = 1;
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DELETE:

The DELETE statement is used to delete data from a database. The syntax for the DELETE statement is as follows:

SQL
DELETE FROM table_name
WHERE condition;
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The table_name is the name of the table that you want to delete data from. The WHERE clause is optional and can be used to filter the rows that are deleted.

For example, the following DELETE statement would delete the employee with the ID of 1:

SQL
DELETE FROM employees
WHERE id = 1;
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I hope this helps!

Alejandro Penzini Answered question October 30, 2023
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