-- tables
-- Table: call
CREATE TABLE call (
    id int  NOT NULL IDENTITY(1, 1),
    employee_id int  NOT NULL,
    customer_id int  NOT NULL,
    start_time datetime  NOT NULL,
    end_time datetime  NULL,
    call_outcome_id int  NULL,
    CONSTRAINT call_ak_1 UNIQUE (employee_id, start_time),
    CONSTRAINT call_pk PRIMARY KEY  (id)
);
    
-- Table: call_outcome
CREATE TABLE call_outcome (
    id int  NOT NULL IDENTITY(1, 1),
    outcome_text char(128)  NOT NULL,
    CONSTRAINT call_outcome_ak_1 UNIQUE (outcome_text),
    CONSTRAINT call_outcome_pk PRIMARY KEY  (id)
);
    
-- Table: customer
CREATE TABLE customer (
    id int  NOT NULL IDENTITY(1, 1),
    customer_name varchar(255)  NOT NULL,
    city_id int  NOT NULL,
    customer_address varchar(255)  NOT NULL,
    next_call_date date  NULL,
    ts_inserted datetime  NOT NULL,
    CONSTRAINT customer_pk PRIMARY KEY  (id)
);
    
-- Table: employee
CREATE TABLE employee (
    id int  NOT NULL IDENTITY(1, 1),
    first_name varchar(255)  NOT NULL,
    last_name varchar(255)  NOT NULL,
    CONSTRAINT employee_pk PRIMARY KEY  (id)
);
    
-- foreign keys
-- Reference: call_call_outcome (table: call)
ALTER TABLE call ADD CONSTRAINT call_call_outcome
    FOREIGN KEY (call_outcome_id)
    REFERENCES call_outcome (id);
    
-- Reference: call_customer (table: call)
ALTER TABLE call ADD CONSTRAINT call_customer
    FOREIGN KEY (customer_id)
    REFERENCES customer (id);
 
-- Reference: call_employee (table: call)
ALTER TABLE call ADD CONSTRAINT call_employee
    FOREIGN KEY (employee_id)
    REFERENCES employee (id);
 
-- Reference: customer_city (table: customer)
ALTER TABLE customer ADD CONSTRAINT customer_city
    FOREIGN KEY (city_id)
    REFERENCES city (id);
    
-- insert values
INSERT INTO call_outcome (outcome_text) VALUES ('call started');
INSERT INTO call_outcome (outcome_text) VALUES ('finished - successfully');
INSERT INTO call_outcome (outcome_text) VALUES ('finished - unsuccessfully');
    
INSERT INTO employee (first_name, last_name) VALUES ('Thomas (Neo)', 'Anderson');
INSERT INTO employee (first_name, last_name) VALUES ('Agent', 'Smith');
    
INSERT INTO customer (customer_name, city_id, customer_address, next_call_date, ts_inserted) VALUES ('Jewelry Store', 4, 'Long Street 120', '2020/1/21', '2020/1/9 14:1:20');
INSERT INTO customer (customer_name, city_id, customer_address, next_call_date, ts_inserted) VALUES ('Bakery', 1, 'Kurfürstendamm 25', '2020/2/21', '2020/1/9 17:52:15');
INSERT INTO customer (customer_name, city_id, customer_address, next_call_date, ts_inserted) VALUES ('Café', 1, 'Tauentzienstraße 44', '2020/1/21', '2020/1/10 8:2:49');
INSERT INTO customer (customer_name, city_id, customer_address, next_call_date, ts_inserted) VALUES ('Restaurant', 3, 'Ulica lipa 15', '2020/1/21', '2020/1/10 9:20:21');
    
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (1, 4, '2020/1/11 9:0:15', '2020/1/11 9:12:22', 2);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (1, 2, '2020/1/11 9:14:50', '2020/1/11 9:20:1', 2);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (2, 3, '2020/1/11 9:2:20', '2020/1/11 9:18:5', 3);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (1, 1, '2020/1/11 9:24:15', '2020/1/11 9:25:5', 3);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (1, 3, '2020/1/11 9:26:23', '2020/1/11 9:33:45', 2);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (1, 2, '2020/1/11 9:40:31', '2020/1/11 9:42:32', 2);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (2, 4, '2020/1/11 9:41:17', '2020/1/11 9:45:21', 2);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (1, 1, '2020/1/11 9:42:32', '2020/1/11 9:46:53', 3);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (2, 1, '2020/1/11 9:46:0', '2020/1/11 9:48:2', 2);
INSERT INTO call (employee_id, customer_id, start_time, end_time, call_outcome_id) VALUES (2, 2, '2020/1/11 9:50:12', '2020/1/11 9:55:35', 2);

MySQL online editor

Write, Run & Share MySQL queries online using OneCompiler's MySQL online editor and compiler for free. It's one of the robust, feature-rich online editor and compiler for MySQL. Getting started with the OneCompiler's MySQL editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'MySQL' and start writing queries to learn and test online without worrying about tedious process of installation.

About MySQL

MySQL is a open-source, free and very popular relational database management system which is developed, distributed and supported by Oracle corporation.

Key Features:

  • Open-source relational database management systems.
  • Reliable, very fast and easy to use database server.
  • Works on client-server model.
  • Highly Secure and Scalable
  • High Performance
  • High productivity as it uses stored procedures, triggers, views to write a highly productive code.
  • Supports large databases efficiently.
  • Supports many operating systems like Linux*,CentOS*, Solaris*,Ubuntu*,Windows*, MacOS*,FreeBSD* and others.

Syntax help

Commands

1. CREATE

CREATE TABLE table_name (
                column1 datatype,
                column2 datatype,
                ....);

Example

CREATE TABLE EMPLOYEE (
  empId INTEGER PRIMARY KEY,
  name TEXT NOT NULL,
  dept TEXT NOT NULL
);

2. ALTER

ALTER TABLE Table_name ADD column_name datatype;

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Dave', 'Sales');

3. TRUNCATE

TRUNCATE table table_name;

4. DROP

DROP TABLE table_name;

5. RENAME

RENAME TABLE table_name1 to new_table_name1;

6. COMMENT

Single-Line Comments:

 --Line1;

Multi-Line comments:

   /* Line1,
   Line2 */

DML Commands

1. INSERT

INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);

Note: Column names are optional.

Example

INSERT INTO EMPLOYEE VALUES (0001, 'Ava', 'Sales');

2. SELECT

SELECT column1, column2, ...
FROM table_name
[where condition];

Example

SELECT * FROM EMPLOYEE where dept ='sales';

3. UPDATE

UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;

Example

UPDATE EMPLOYEE SET dept = 'Sales' WHERE empId='0001';

4. DELETE

DELETE FROM table_name where condition;

Example

DELETE from EMPLOYEE where empId='0001';

Indexes

1. CREATE INDEX

  CREATE INDEX index_name on table_name(column_name);
  • To Create Unique index:
  CREATE UNIQUE INDEX index_name on table_name(column_name);

2. DROP INDEX

DROP INDEX index_name ON table_name;

Views

1. Create a View

Creating a View:
CREATE VIEW View_name AS 
Query;

2. How to call view

SELECT * FROM View_name;

3. Altering a View

ALTER View View_name AS 
Query;

4. Deleting a View

DROP VIEW View_name;

Triggers

1. Create a Trigger

CREATE TRIGGER trigger_name trigger_time trigger_event
    ON tbl_name FOR EACH ROW [trigger_order] trigger_body
/* where
trigger_time: { BEFORE | AFTER }
trigger_event: { INSERT | UPDATE | DELETE }
trigger_order: { FOLLOWS | PRECEDES } */

2. Drop a Trigger

DROP TRIGGER [IF EXISTS] trigger_name;

Stored Procedures

1. Create a Stored Procedure

CREATE PROCEDURE sp_name(p1 datatype)
BEGIN
/*Stored procedure code*/
END;

2. How to call Stored procedure

CALL sp_name;

3. How to delete stored procedure

DROP PROCEDURE sp_name;

Joins

1. INNER JOIN

SELECT * FROM TABLE1 INNER JOIN TABLE2 where condition;

2. LEFT JOIN

SELECT * FROM TABLE1 LEFT JOIN TABLE2 ON condition;

3. RIGHT JOIN

SELECT * FROM TABLE1 RIGHT JOIN TABLE2 ON condition;

4. CROSS JOIN

SELECT select_list from TABLE1 CROSS JOIN TABLE2;