I was using the database command of MySQL, I thought I should share these to help the world with a collection of the most common command of MySQL. Let’s get started. If you would like my collection let me know in the comment box so I can work more to impove my blog to help you guys.
CREATE SCHEMA DatabaseName;
create database DatabaseName;
CREATE SCHEMA School;
create database school;
This command is used to delete a database along with the whole data present in the database that you have added.
DROP SCHEMA DataBaseName; –OR DROP DATABASE DatabaseName;
DROP SCHEMA School; -Or DROP DATABASE School;
If there is one database or many, then you will have make one as default to start work. So you will have to use command “USE”. Its syntax is USE DataBaseName;
For Example database name is College, then you will have to write this command. “USE”
USE College;
If you have used a SQL command then you do not want to use that command, make it into comment.
Use this command. “–“
–use college;
SELECT column_name
FROM table_name;
SELECT statements fetch data from a table of a database. It is very common command to check the data of table from a database.
There is one common patron to select all columns records. “*” star mean select all columns.
select * from school;
select all columns from table school
CREATE TABLE table_name (
column_1 datatype,
column_2 datatype,
column_3 datatype
);
CREATE TABLE statements create a new table in the database of MySQl or SQL.
ALTER TABLE table_name
ADD column_name datatype;
ALTER TABLE statements add, delete, or modify columns in an existing table of MySQL.
DROP TABLE table_name;
DROP TABLE statements drop an existing table in a database of MySQL.
UPDATE table_name
SET some_column = some_value
WHERE some_column = some_value
UPDATE statements allow us to edit rows in a table of database. If “where” condition is not used then whole data will be updated. So be careful.
INSERT INTO table_name (column_1, column_2, column_3)
VALUES (value_1, ‘value_2’, value_3);
INSERT statements add a new row or multiple rows to a table of database.
DELETE FROM table_name
WHERE some_column = some_value;
DELETE statements remove rows from a table of database. If it “where” condition is not used then whole data will be deleted.
CREATE INDEX index_name
ON table_name (column_name1, column_name2…);
Index statements create on existing tables to retrieve the rows quickly and easily.
ALTER TABLE table_name
DROP INDEX index_name;
DROP INDEX statements delete an index in a table. very helpful
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