Querying Data in SQL | Insert | Update | Delete | DML Commands in SQL
In SQL, you can use the following statements to insert, update, and delete data in tables:
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Insert data: To insert new data into a table, you can use the INSERT INTO statement. Here is an example of a basic INSERT INTO statement:
INSERT INTO table_name (column1, column2, column3) VALUES (value1, value2, value3);
This statement inserts a new row into the specified table with the specified values for the specified columns. You can insert multiple rows at once by separating the values with commas and enclosing each row in parentheses.
Update data: To update existing data in a table, you can use the UPDATE statement. Here is an example of a basic UPDATE statement:
UPDATE table_name SET column_name = 'new_value' WHERE condition;
This statement updates the specified column in the specified table with the specified new value where the specified condition is true. You can update multiple columns and rows at once by specifying multiple SET and WHERE clauses.
Delete data: To delete existing data from a table, you can use the DELETE FROM statement. Here is an example of a basic DELETE FROM statement:
DELETE FROM table_name WHERE condition;
This statement deletes all rows from the specified table where the specified condition is true. You can delete specific columns by listing them after the DELETE keyword.
It's important to be careful when using these statements, as they can modify or delete large amounts of data quickly. It's recommended to always test your statements on a small sample of data before applying them to a larger dataset. Additionally, it's a good practice to make backups of your data before making any modifications to your tables.
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