Modify Database Table: SQL Guide

1 year ago
Olivia Parker
1 minute

You can use SQL statements to perform various operations to modify the content of a database table. Here are some common operations:

  1. Inserting data: Use the INSERT INTO statement to add new rows of data to the table.
INSERT INTO table_name (column1, column2, column3, ...)
VALUES (value1, value2, value3, ...);
  1. Update data: Use the UPDATE statement to modify rows in a table.
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
  1. Delete data: Use the DELETE statement to remove rows from a table.
DELETE FROM table_name
WHERE condition;
  1. Alter table structure: Use the ALTER TABLE statement to modify the structure of a table, such as adding columns, changing column types, deleting columns, etc.
ALTER TABLE table_name
ADD column_name datatype;

ALTER TABLE table_name
MODIFY column_name datatype;

ALTER TABLE table_name
DROP COLUMN column_name;

Before making any changes to the contents of the table, please remember to backup the data in case of unforeseen circumstances.

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