tee 2026_3_18_sql_log.txt

-- A very simple stored procedure.
-- Redefine the delimiter to end the procedure.


-- default delimiter ;

DELIMITER $$

CREATE OR REPLACE PROCEDURE deptInfo(IN dCode VARCHAR(4), OUT numFaculty INT)
BEGIN
   --  Display some information: side effect
   SELECT d.deptName, d.SchoolCode, t1.n_majors, t2.n_minors
   FROM department AS d INNER JOIN
      (SELECT COUNT(stuId) AS n_majors
      FROM student
      WHERE major = dCode) AS t1 INNER JOIN
      (SELECT COUNT(stuId) AS n_minors
      FROM student
      WHERE minor = dCode) AS t2
   WHERE d.deptCode = dCode;

   -- MySQL does not direct sending output to console.
   -- It is necessary to use a SQL statement.
   SELECT 'Debuggin comment can be put here.';
   SELECT CONCAT('Faculty in the department: ', dCode) AS faculty;

   SELECT *
   FROM faculty AS f
   WHERE f.deptCode = dCode;

   SELECT COUNT(f.facId) INTO numFaculty
   FROM faculty AS f
   WHERE f.deptCode = dCode;
END $$

DELIMITER ;

SHOW CREATE PROCEDURE deptInfo;

SET @numFaculty = 0;
SET @dCode = 'CSCI';
CALL deptInfo(@dCode, @numFaculty);
SELECT @dCode, @numFaculty;

SET @dCode = 'ITEC';
CALL deptInfo(@dCode, @numFaculty);
SELECT @dCode, @numFaculty;

-- CREATE OR REPLACE PROCEDURE deptInfo(IN dCode VARCHAR(4), OUT numFaculty INT)
CALL deptInfo('CINF', @numFaculty);
SELECT 'CINF', @numFaculty;

CALL deptInfo(CONCAT('CS', 'CI'), @numFaculty);

CALL deptInfo('CINF', 3);

-- A simple function
DELIMITER //

CREATE OR REPLACE FUNCTION n_major(dCode varchar(4)) RETURNS INT
READS SQL DATA
BEGIN
   DECLARE count INT DEFAULT 0;

   SELECT COUNT(*) INTO count
   FROM student
   WHERE major = dCode;

   RETURN count;
END //

DELIMITER ;

SHOW CREATE FUNCTION n_major;

SELECT n_major('CSCI');
SELECT n_major('ITEC');

-- A simple function
DELIMITER //

CREATE OR REPLACE FUNCTION n_major(dCode varchar(4)) RETURNS INT
READS SQL DATA
BEGIN
   DECLARE count INT DEFAULT 0;

   SELECT COUNT(*) INTO count
   FROM student
   WHERE major = dCode;

   RETURN count;
END //

DELIMITER ;

SHOW CREATE FUNCTION n_major;

SELECT n_major('CSCI');
SELECT n_major('ITEC');

SELECT t.TABLE_SCHEMA AS `schema`, COUNT(t.TABLE_NAME) AS num_tables
FROM information_schema.tables AS t
WHERE t.TABLE_TYPE = 'BASE TABLE'
GROUP BY `schema`
ORDER BY num_tables DESC;

SELECT t.TABLE_SCHEMA AS `schema`, COUNT(t.TABLE_NAME) AS num_tables
FROM information_schema.tables AS t
WHERE t.ENGINE = 'MEMORY'
GROUP BY `schema`
ORDER BY num_tables DESC;