MySQL and PL/SQL are two different database management systems, representing the characteristics of relational databases and procedural languages respectively. This article will compare the similarities and differences between MySQL and PL/SQL, with specific code examples to illustrate.
MySQL is a popular relational database management system that uses Structured Query Language (SQL) to manage and operate the database. PL/SQL is a procedural language unique to Oracle database and is used to write database objects such as stored procedures, triggers and functions.
Same points:
Differences:
Sample code comparison:
The following is a simple example showing the stored procedure definition and calling process in MySQL and PL/SQL respectively:
MySQL stored procedure example:
DELIMITER $$ CREATE PROCEDURE GetEmployeeByID(IN employee_id INT) BEGIN SELECT * FROM employees WHERE employee_id = employee_id; END$$ DELIMITER; CALL GetEmployeeByID(1001);
PL/SQL stored procedure example:
CREATE OR REPLACE PROCEDURE GetEmployeeByID (employee_id IN employees.employee_id%TYPE) IS v_employee employees%ROWTYPE; BEGIN SELECT * INTO v_employee FROM employees WHERE employee_id = employee_id; DBMS_OUTPUT.PUT_LINE('Employee Name: ' || v_employee.employee_name); END; / EXEC GetEmployeeByID(1001);
Through the above example, we can see that the syntax and calling methods of the two are different. MySQL uses DELIMITER
to define stored procedures, while PL/SQL uses CREATE OR REPLACE PROCEDURE
to define. At the same time, DBMS_OUTPUT.PUT_LINE
is used in PL/SQL to output results, while query operations are performed directly in MySQL.
To sum up, there are some differences in syntax and functions between MySQL and PL/SQL. Developers can choose a suitable database management system according to project needs to complete the corresponding work.
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