MySQL Training

Aug 21, 2014Download as PPTX, PDF0 likes547 views

This is a simple MySQL by Manish Mittal of OpenSource Technologies Pvt. Ltd. It contains Joins, Triggers, Stored procedures, and functions

MySQL Training
By Manish Mittal
OpenSource Technologies Pvt. Ltd.
http://www.opensourcetechnologies.com

Types of Joins
• CROSS JOIN:-This type of join is the simplest join. The cross join result in
cartesian product of all the records from two tables.
select * from employee cross join department
• INNER JOIN OR EQUI JOIN:-This is the type of join where tables are
combined based on a common column.
select * from employee , department where employee .deptid=
department.depid;
• OUTER JOIN:- Join is used to combine all rows of one table with matching
rows from the other table and also show unmatchable records from other
table. It is used whenever multiple tables must be accessed through a SQL
SELECT statement
SELECT * FROM roseindia AS R
-> LEFT JOIN newstrack AS N
-> ON R.EmpId = N.EmpId
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Triggers
• A trigger is a named database object that is
associated with a table, and that activates
when a particular event occurs for the table.
Some uses for triggers are to perform checks
of values to be inserted into a table or to
perform calculations on values involved in an
update.
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Trigger Example
• CREATE TRIGGER ins_sum BEFORE INSERT ON
account -> FOR EACH ROW SET @sum = @sum
+ NEW.amount;
• create trigger bi_emps_fer before insert on
emps for each row begin insert into audit
(user_name, table_name, update_date)
values (current_user(),’emps’,now()); end; //
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Procedure Example
• delimiter //
• CREATE PROCEDURE simpleproc (OUT
param1 INT) -> BEGIN -> SELECT COUNT(*)
INTO param1 FROM t; ->
• END//
• delimiter ;
• CALL simpleproc(@a);
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Function Example
• CREATE FUNCTION hello (s CHAR(20))
RETURNS CHAR(50) DETERMINISTIC ->
RETURN CONCAT('Hello, ',s,'!');
• SELECT hello('world');
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S.Pro Vs functions
• There is one main difference between functions and
procedures.
A function must return a value and it can be only a
single value. Any number of parameters can be passed
in but only 1 value can be passed out. This value
coming out must be done via the RETURN.
A Procedure doesn't have to return anything. But it can
accept any number of parameters in and also any
number of parameters out. There is no RETURN in a
procedure.
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Transaction
• The START TRANSACTION or BEGIN statement
begins a new transaction. COMMIT commits
the current transaction, making its changes
permanent. ROLLBACK rolls back the current
transaction, canceling its changes. The SET
autocommit statement disables or enables the
default autocommit mode for the current
session.
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Save points
• SAVEPOINT identifier
• ROLLBACK TO [SAVEPOINT] identifier
• RELEASE SAVEPOINT identifier
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Cursors
• Cursor can be created inside the stored
procedures, functions and triggers. Cursors
are used for rows iteration returned by a
query on a row-by-row basis. It is different
from typical SQL commands that operate on
all the rows in the set returned by a query at
one time.
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1. MySQL Training By Manish Mittal OpenSource Technologies Pvt. Ltd. http://www.opensourcetechnologies.com

2. Types of Joins • CROSS JOIN:-This type of join is the simplest join. The cross join result in cartesian product of all the records from two tables. select * from employee cross join department • INNER JOIN OR EQUI JOIN:-This is the type of join where tables are combined based on a common column. select * from employee , department where employee .deptid= department.depid; • OUTER JOIN:- Join is used to combine all rows of one table with matching rows from the other table and also show unmatchable records from other table. It is used whenever multiple tables must be accessed through a SQL SELECT statement SELECT * FROM roseindia AS R -> LEFT JOIN newstrack AS N -> ON R.EmpId = N.EmpId http://www.opensourcetechnologies.com

3. Triggers • A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table. Some uses for triggers are to perform checks of values to be inserted into a table or to perform calculations on values involved in an update. http://www.opensourcetechnologies.com

4. Trigger Example • CREATE TRIGGER ins_sum BEFORE INSERT ON account -> FOR EACH ROW SET @sum = @sum + NEW.amount; • create trigger bi_emps_fer before insert on emps for each row begin insert into audit (user_name, table_name, update_date) values (current_user(),’emps’,now()); end; // http://www.opensourcetechnologies.com

5. Procedure Example • delimiter // • CREATE PROCEDURE simpleproc (OUT param1 INT) -> BEGIN -> SELECT COUNT(*) INTO param1 FROM t; -> • END// • delimiter ; • CALL simpleproc(@a); http://www.opensourcetechnologies.com

6. Function Example • CREATE FUNCTION hello (s CHAR(20)) RETURNS CHAR(50) DETERMINISTIC -> RETURN CONCAT('Hello, ',s,'!'); • SELECT hello('world'); http://www.opensourcetechnologies.com

7. S.Pro Vs functions • There is one main difference between functions and procedures. A function must return a value and it can be only a single value. Any number of parameters can be passed in but only 1 value can be passed out. This value coming out must be done via the RETURN. A Procedure doesn't have to return anything. But it can accept any number of parameters in and also any number of parameters out. There is no RETURN in a procedure. http://www.opensourcetechnologies.com

8. Transaction • The START TRANSACTION or BEGIN statement begins a new transaction. COMMIT commits the current transaction, making its changes permanent. ROLLBACK rolls back the current transaction, canceling its changes. The SET autocommit statement disables or enables the default autocommit mode for the current session. http://www.opensourcetechnologies.com

9. Save points • SAVEPOINT identifier • ROLLBACK TO [SAVEPOINT] identifier • RELEASE SAVEPOINT identifier http://www.opensourcetechnologies.com

10. Cursors • Cursor can be created inside the stored procedures, functions and triggers. Cursors are used for rows iteration returned by a query on a row-by-row basis. It is different from typical SQL commands that operate on all the rows in the set returned by a query at one time. http://www.opensourcetechnologies.com

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