-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathUpcoming Dev.sql
More file actions
787 lines (684 loc) · 13.5 KB
/
Upcoming Dev.sql
File metadata and controls
787 lines (684 loc) · 13.5 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
SELECT
*
FROM
departments;
SELECT
*
FROM
salaries
ORDER BY salary DESC;
USE employees;
SELECT
MAX(emp_no)
FROM
employees;
SELECT
MIN(emp_no)
FROM
employees;
SELECT
ROUND(AVG(salary),0)
FROM
salaries;
CREATE TABLE departments_dup
(
dept_no CHAR(4) NOT NULL,
dept_name VARCHAR(40) NOT NULL
);
INSERT INTO departments_dup
(
dept_no,
dept_name
)
select * from departments;
SELECT
*
FROM
departments_dup;
INSERT INTO departments_dup
(
dept_no,
dept_name
)VALUES
(
'd010',
'Senior Analysis'
);
INSERT INTO departments_dup
(
dept_no,
dept_name
) VALUES
(
'd011',
'Business Analysis'
);
COMMIT;
SELECT
*
FROM
departments_dup;
SELECT
*
FROM
departments_dup
ORDER BY dept_name DESC;
DELETE FROM departments_dup;
DELETE FROM departments_dup
WHERE
dept_name = 'Business Analysis';
SELECT
*
FROM
departments_dup;
INSERT INTO departments_dup
(
dept_no
) VALUES
( 'd010'
);
SELECT
*
FROM
departments_dup;
SELECT
*
FROM
employees
ORDER BY emp_no DESC;
COMMIT;
INSERT INTO employees
(
emp_no,
birth_date,
first_name,
last_name,
gender,
hire_date
) VALUES
(
999901,
'1986-04-21',
'John',
'Smith',
'M',
'2011-01-01'
);
COMMIT;
SELECT
*
FROM
titles
LIMIT 10;
INSERT INTO employees
VALUES
(
999903,
'1977-09-14',
'Johnathan',
'Creek',
'M',
'1991-01-01'
);
COMMIT;
INSERT INTO titles
VALUES
(
999903,
'Senior Engineer',
'1997-10-01',
'9999-01-01'
);
INSERT INTO dept_emp
(
emp_no,
dept_no,
from_date,
to_date
) VALUES
(
999903,
'd005',
'1997-10-01',
'9999-01-01'
);
SELECT
*
FROM
departments
ORDER BY dept_no;
INSERT INTO departments
VALUES
(
'd010',
'Business Analysis'
);
SELECT
*
FROM
departments
ORDER BY dept_no;
COMMIT;
UPDATE departments_dup
SET
DEPT_NO = 'd011',
dept_name = 'Quality Control';
select * from departments_dup;
COMMIT;
UPDATE departments
SET
dept_name = 'Data Analysis'
Where
dept_no = 'd010';
Select * from departments;
COMMIT;
SELECT
*
FROM
titles
WHERE
emp_no = 999903;
SELECT
dept_no,
dept_name,
COALESCE(dept_manager, dept_name, 'N/A') AS dept_manager
FROM
departments_dup
ORDER BY dept_no ASC;
ALTER TABLE departments_dup
ADD COLUMN dept_manager CHAR(50);
SELECT
*
FROM
departments_dup
ORDER BY dept_no ASC;
SELECT
dept_no,
dept_name,
IFNULL(dept_no, 'N/A') AS dept_no,
IFNULL(dept_name,
'Department name not provided') AS dept_name,
COALESCE(dept_no,dept_name) AS dept_info
FROM
departments_dup
ORDER BY dept_no ASC;
SELECT
*
FROM
departments_dup;
ALTER TABLE departments_dup
DROP COLUMN dept_manager;
ALTER TABLE departments_dup
CHANGE COLUMN dept_no dept_no CHAR(4) NULL;
ALTER TABLE departments_dup
CHANGE COLUMN dept_name dept_name varchar(40) NULL;
select * from departments_dup;
COMMIT;
INSERT INTO departments_dup(dept_name)
VALUES ('Public Relations');
INSERT INTO departments_dup(dept_no)
VALUES ('d010');
INSERT INTO departments_dup(dept_no)
VALUES ('d011');
Select * from departments_dup;
COMMIT;
CREATE TABLE dept_manager_dup
(
emp_no int(11) NOT NULL,
dept_no char(4) NULL,
from_date date NOT NULL,
to_date date NULL
);
INSERT INTO dept_manager_dup
select * from dept_manager;
select * from dept_manager_dup;
COMMIT;
SELECT
*
FROM
departments_dup
ORDER BY dept_no;
select m.dept_no,m.emp_no, d.dept_name
from dept_manager_dup m
inner join
departments_dup d ON m.dept_no = d.dept_no
order by m.dept_no;
select e.emp_no, e.first_name, e.last_name, d.dept_no, e.hire_date -- INNER JOINS examples
from employees e
INNER JOIN
dept_manager d ON e.emp_no = d.emp_no;
-- LEFT JOINS/RIGHT JOINS INVERTED examples
-- practice this daily
SELECT
e.emp_no, e.first_name, e.last_name, d.dept_no, d.from_date
FROM
dept_manager d
RIGHT JOIN
employees e ON d.emp_no = e.emp_no
WHERE
e.last_name = 'Markovitch'
ORDER BY d.dept_no DESC , e.emp_no;
-- The New and the Old Joins Syntax
SELECT m.dept_no, m.emp_no, d.dept_name
FROM
dept_manager_dup m,
departments_dup d
WHERE
m.dept_no = d.dept_no
ORDER BY m.dept_no;
SELECT e.first_name, e.last_name, d.dept_no, e.hire_date,d.emp_no
FROM
dept_manager d,
employees e
WHERE
d.emp_no = e.emp_no;
set @@global.sql_mode := replace(@@global.sql_mode,'ONLY_FULL_GROUP_BY','');
Select e.first_name, e.last_name,e.hire_date,t.title
from employees e
INNER JOIN titles t ON e.emp_no = t.emp_no
WHERE
first_name = 'Margareta'
AND last_name = 'Markovitch'
ORDER BY e.emp_no;
-- CROSS JOINS
SELECT dm.*,d.*
FROM
dept_manager dm
CROSS JOIN
departments d
WHERE d.dept_no <> dm.dept_no -- what should we do if we want to display all departments but the one where the manager is currently head of ?
ORDER BY dm.emp_no,d.dept_no;
SELECT e.*,d.*
FROM
employees e
CROSS JOIN
departments d
WHERE e.emp_no < 10011
ORDER BY e.emp_no, d.dept_name;
SELECT
e.first_name,
e.last_name,
e.hire_date,
t.title,
m.from_date,
d.dept_name
FROM
employees e
JOIN
dept_manager m ON e.emp_no = m.emp_no
JOIN
departments d ON m.dept_no = d.dept_no
JOIN
titles t ON e.emp_no = t.emp_no
AND m.from_date = t.from_date
ORDER BY e.emp_no;
select d.dept_name, AVG(salary) AS average_salary
FROM
departments d
JOIN
dept_manager m ON d.dept_no = m.dept_no
JOIN
salaries s ON m.emp_no = s.emp_no
GROUP BY d.dept_name
HAVING average_salary > 60000
ORDER BY average_salary DESC;
select e.gender, COUNT(dm.emp_no)
FROM
employees e
JOIN
dept_manager dm ON e.emp_no = dm.emp_no
GROUP BY gender;
CREATE TABLE employees_dup
(
emp_no int(11),
birth_date date,
first_name VARCHAR(14),
last_name VARCHAR(16),
gender enum ('M','F'),
hire_date date
);
INSERT INTO employees_dup
SELECT e.*
from employees e
LIMIT 20;
select * from employees_dup;
COMMIT;
INSERT INTO employees_dup VALUES
('10001','153-09-02','Georgi','Facello','M','1986-06-26');
select * from employees_dup;
SELECT
*
FROM
(SELECT
e.emp_no, e.first_name, e.last_name, NULL AS dept_no, NULL AS from_date
FROM
employees e
WHERE
last_name='Denis'
UNION SELECT
NULL AS emp_no,
NULL AS first_name,
NULL AS last_name,
dm.dept_no,
dm.from_date
FROM
dept_manager dm) as a
ORDER BY -a.emp_no DESC;
Select
e.first_name, e.last_name
FROM
employees e
WHERE
e.emp_no IN (Select
dm.emp_no
FROM
dept_manager dm);
Select
*
FROM
dept_manager
WHERE
emp_no IN(Select emp_no
From employees e
WHERE
hire_date BETWEEN '1990-01-01' AND '1995-01-01');
Select
e.first_name, e.last_name
FROM
employees e
WHERE
EXISTS( Select
*
FROM
dept_manager dm
WHERE
dm.emp_no = e.emp_no);
Select *
from
employees e
WHERE
EXISTS( Select
*
FROM
titles t
WHERE
t.emp_no = e.emp_no
AND title = 'Assistant Engineer');
Select A.* -- SQL Subqueries Nested in Select and From examplessss
FROM
(SELECT
e.emp_no AS employee_ID,
MIN(de.dept_no) AS department_code,
(Select
emp_no
FROM
dept_manager
WHERE
emp_no = 110022) AS manager_ID
FROM
employees e
JOIN dept_emp de ON e.emp_no = de.emp_no
WHERE
e.emp_no <= 10020
GROUP BY e.emp_no
ORDER BY e.emp_no) AS A
UNION Select
B.*
FROM
(SELECT
e.emp_no AS employee_ID,
MIN(de.dept_no) AS department_code,
(Select
emp_no
FROm
dept_manager
WHERE
emp_no = 110039) AS manager_ID
FROM
employees e
JOIN dept_emp de ON e.emp_no = de.emp_no
WHERE
e.emp_no > 10020
GROUP BY e.emp_no
ORDER BY e.emp_no
LIMIT 20) AS B;
CREATE TABLE emp_mananger
(
emp_no int(11) NOT NULL,
dept_no CHAR(4) NULL,
manager_no int(11) NOT NULL
);
INSERT INTO emp_mananger
SELECT
U.*
FROM
(Select A.*
FROM
(SELECT
e.emp_no AS employee_ID,
MIN(de.dept_no) AS department_code,
(Select
emp_no
FROM
dept_manager
WHERE
emp_no = 110022) AS manager_ID
FROM
employees e
JOIN dept_emp de ON e.emp_no = de.emp_no
WHERE
e.emp_no <= 10020
GROUP BY e.emp_no
ORDER BY e.emp_no) AS A
UNION SELECT
B.*
FROM
(SELECT
e.emp_no AS employee_ID,
MIN(de.dept_no) AS department_code,
(Select
emp_no
FROm
dept_manager
WHERE
emp_no = 110039) AS manager_ID
FROM
employees e
JOIN dept_emp de ON e.emp_no = de.emp_no
WHERE
e.emp_no > 10020
GROUP BY e.emp_no
ORDER BY e.emp_no
LIMIT 20) AS B
UNION Select
C.*
FROM
(SELECT
e.emp_no AS employee_ID,
MIN(de.dept_no) AS department_code,
(Select
emp_no
FROM
dept_manager
WHERE
emp_no = 110039) AS manager_ID
FROM
employees e
JOIN dept_emp de ON e.emp_no = de.emp_no
WHERE
e.emp_no = 110022
GROUP BY e.emp_no
ORDER BY e.emp_no) AS C
UNION SELECT
D.*
FROM
(SELECT
e.emp_no AS employee_ID,
MIN(de.dept_no) AS department_code,
(Select
emp_no
FROm
dept_manager
WHERE
emp_no = 110022) AS manager_ID
FROM
employees e
JOIN dept_emp de ON e.emp_no = de.emp_no
WHERE
e.emp_no = 110039
GROUP BY e.emp_no
ORDER BY e.emp_no
LIMIT 20) AS D) AS U;
Select * from emp_mananger;
SELECT -- self joins examples (From the mananger table, extract the record data only of those employees who are mananger as well)
e1.*
FROM
emp_mananger e1
JOIN
emp_mananger e2 ON e1.emp_no = e2.manager_no
WHERE
e2.emp_no IN (Select
manager_no
FROM
emp_mananger);
-- CREATE VIEW STATEMENT =
CREATE VIEW v_Average_Manager_Salary AS
SELECT
ROUND(AVG(salary), 2)
FROM
salaries s
JOIN
dept_manager m ON s.emp_no = m.emp_no;
CREATE VIEW v_Employees_Managers AS
SELECT
e.emp_no, e.first_name, e.last_name
FROM
employees e
JOIN
dept_manager m ON e.emp_no = m.emp_no
GROUP BY emp_no;
-- STORE PROCEDURE
USE employees;
DROP PROCEDURE IF EXISTS select_employees;
SELECT
emp_no, from_date, to_date, COUNT(emp_no) AS Num
FROM dept_emp
GROUP BY emp_no
HAVING Num > 1;
select current_date();
USE employees;
DELIMITER $$
CREATE PROCEDURE select_employees()
BEGIN
SELECT * FROM employees
LIMIT 1000;
END$$
DELIMITER ;
average_salary_employee DELIMITER $$
CREATE PROCEDURE average_salary_employee()
BEGIN
SELECT emp_no,avg(salary) From salaries
LIMIT 1000;
END $$
DELIMITER ;
CALL average_salary_employee();
-- at this stage, we can talk about invoking the procedure.
-- basically, there are three main ways to do this.alter
-- first one involves the following syntax
call employees.select_employees();
call select_employees();
USE employees;
DROP procedure IF EXISTS emp_salary;
DELIMITER $$
USE employee $$
CREATE PROCEDURE emp_salary(IN p_emp_no INTEGER)
BEGIN
SELECT
e.first_name, e.last_name, AVG(s.salary)
FROM
employees e
JOIN
salaries s ON e.emp_no = s.emp_no
WHERE
e.emp_no = p_emp_no;
END $$
DELIMITER ;
DELIMITER $$
CREATE PROCEDURE emp_avg_salary_out(in p_emp_no INTEGER, out p_avg_salary DECIMAL(10,2))
BEGIN
SELECT
AVG(s.salary)
INTO p_avg_salary FROM
employees e
JOIN
salaries s ON e.emp_no = s.emp_no
WHERE
e.emp_no = p_emp_no;
END $$
DELIMITER ;
-- Create a procedure called "emp_info' that uses as paramters the first and the last name of an individual, and returns their employee nu
DELIMITER $$
CREATE PROCEDURE emp_info(in p_first_name varchar (255),in p_last_name varchar(255), out p_emp_no INTEGER)
BEGIN
SELECT
e.emp_no
INTO p_emp_no FROM
employees e
WHERE
e.first_name = p_first_name
AND e.last_name = p_last_name;
END $$
DELIMITER ;
SET @v_avg_salary = 0;
CALL employees.emp_avg_salary_out(11300,@v_avg_salary);
SELECT @v_avg_salary;
SET @v_emp_no = 0;
CALL employees.emp_info('Aruna','Journel',@v_emp_no);
SELECT @v_emp_no;
DELIMITER $$
CREATE FUNCTION f_emp_avg_salary (p_emp_no INTEGER) RETURNS DECIMAL (10,2)
DETERMINISTIC NO SQL READS SQL DATA
BEGIN
DECLARE v_avg_salary DECIMAL (10,2);
SELECT
AVG(s.salary)
INTO v_avg_salary FROM
employees e
JOIN
salaries s ON e.emp_no = s.emp_no
WHERE
e.emp_no = p_emp_no;
RETURN v_avg_salary;
END $$
DELIMITER ;
drop function IF EXISTS f_emp_avg_salary
DELIMITER $$
CREATE FUNCTION f_emp_info (p_first_name VARCHAR(255), p_last_name VARCHAR(255)) RETURNS DECIMAL (10,2)
DETERMINISTIC NO SQL READS SQL DATA
BEGIN
DECLARE v_max_from_date DATE;
DECLARE v_salary DECIMAL (10,2);
SELECT
max(from_date)
INTO v_max_from_date FROM
employees e
JOIN
salaries s ON e.emp_no = s.emp_no
WHERE
e.first_name = p_first_name
AND
e.last_name = p_last_name;
SELECT
s.salary
INTO v_salary FROM
employees e
JOIN
salaries s ON e.emp_no = s.emp_no
WHERE e.first_name = p_first_name
AND
e.last_name = p_last_name
AND
s.from_date = v_max_from_date;
RETURN v_salary;
END $$
DELIMITER ;