Lab # 2 Hands-On. DDL Basic SQL Statements Institute of Computer Science, University of Tartu, Estonia
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1 Lab # 2 Hands-On DDL Basic SQL Statements Institute of Computer Science, University of Tartu, Estonia Part A: Demo by Instructor in Lab a. Data type of MySQL b. CREATE table c. ALTER table (ADD, CHANGE, MODIFY and DROP columns) d. RENAME table e. DROP table Part B: Hands-on by Students in Lab Part A: Demo by Instructor in Lab a. Data type of MySQL Properly defining the fields in a table is important to the overall optimization of your database. You should use only the type and size of field; Don't define a field as 30 or so characters wide if you know you're only going to use 2 or 3 characters. MySQL uses many different data types broken into three categories: numeric, date and time, and string types. Numeric Types are: TINYINT: A very small integer that can be signed or unsigned. If signed, the allowable range is from -128 to 127. If unsigned, the allowable range is from 0 to 255. You can specify a width of up to 4 digits. SMALLINT: A small integer that can be signed or unsigned. If signed, the allowable range is from to If unsigned, the allowable range is from 0 to You can specify a width of up to 5 digits. MEDIUMINT: A medium-sized integer that can be signed or unsigned. If signed, the allowable range is from to If unsigned, the allowable range is from 0 to You can specify a width of up to 9 digits. INT: A normal-sized integer that can be signed or unsigned. If signed, the allowable range is from to If unsigned, the allowable range is from 0 to You can specify a width of up to 11 digits. Page 1 of 5
2 BIGINT: A large integer that can be signed or unsigned. If signed, the allowable range is from to If unsigned, the allowable range is from 0 to You can specify a width of up to 20 digits. FLOAT(M,D): A floating-point number that cannot be unsigned. You can define the display length (M) and the number of decimals (D). Decimal precision can go to 24 places for a FLOAT. DOUBLE(M,D): A double precision floating-point number that cannot be unsigned. You can define the display length (M) and the number of decimals (D). Decimal precision can go to 53 places for a DOUBLE. DECIMAL(M,D): An unpacked floating-point number that cannot be unsigned. In unpacked decimals, each decimal corresponds to one byte. Defining the display length (M) and the number of decimals (D) is required. Date and Time Types are: DATE: A date in YYYY-MM-DD format. For example, February 29th, 2016 would be stored as DATETIME: A date and time combination in YYYY-MM-DD HH:MM:SS format. For example, 2:30 in the afternoon on February 29th, 2016 would be stored as :30:00. TIMESTAMP: A timestamp, this looks like the previous DATETIME format, only without the hyphens between numbers; 4:30 in the afternoon on February 29th, 2016 would be stored as ( YYYYMMDDHHMMSS). TIME: Stores the time in HH:MM:SS format. YEAR(M) - Stores a year in 2-digit or 4- digit format. If the length is specified as 2 (for example YEAR(2)), YEAR can be 16, If the length is specified as 4, YEAR can be The default length is 4. String Types are: CHAR(M): A fixed-length string between 1 and 255 characters in length (for example CHAR(5)), right-padded with spaces to the specified length when stored. Defining a length is not required, but the default is 1. VARCHAR(M): A variable-length string between 1 and 255 characters in length; for example VARCHAR(25). You must define a length when creating a VARCHAR field. TINYBLOB or TINYTEXT: A BLOB or TEXT column with a maximum length of 255 characters. You do not specify a length with TINYBLOB or TINYTEXT. Page 2 of 5
3 MEDIUMBLOB or MEDIUMTEXT: A BLOB or TEXT column with a maximum length of characters. You do not specify a length with MEDIUMBLOB or MEDIUMTEXT. BLOB or TEXT: A field with a maximum length of characters. BLOBs are "Binary Large Objects" and are used to store large amounts of binary data, such as images or other types of files. LONGBLOB or LONGTEXT: A BLOB or TEXT column with a maximum length of characters. You do not specify a length with LONGBLOB or LONGTEXT. ENUM: An enumeration, which is a fancy term for list. When defining an ENUM, you are creating a list of items from which the value must be selected (or it can be NULL). For example, if you wanted your field to contain "A" or "B" or "C", you would define your ENUM as ENUM ('A', 'B', 'C') and only those values (or NULL) could ever populate that field. b. CREATE table: Here is generic SQL syntax to create a MySQL table: CREATE TABLE table_name (column_name column_type); CREATE TABLE users ( username VARCHAR (30), password VARCHAR (20) ); Now, we will create following table in mydatabase. CREATE TABLE faculty_tbl ( id INT NOT NULL AUTO_INCREMENT, teacher_name VARCHAR(50) NOT NULL, teacher_salary float(10,2) NOT NULL, Joining_date DATE, PRIMARY KEY (id) ); Page 3 of 5
4 Explanation of some above mentioned items: NOT NULL: Field Attribute NOT NULL is being used because we do not want this field to be NULL. So if user will try to create a record with NULL value, then MySQL will raise an error. AUTO_INCREMENT: Field Attribute AUTO_INCREMENT tells MySQL to go ahead and add the next available number to the id field. PRIMARY KEY: Keyword PRIMARY KEY is used to define a column as primary key. You can use multiple columns separated by comma to define a primary key. See the description of the table. DESC faculty_tbl Or SHOW COLUMNS FROM faculty_tbl c. ALTER table: To add a new column in a table, use the following syntax: ALTER TABLE table_name ADD column_name datatype Add new Column: ADD degree VARCHAR(30) NULL ADD DateOfBirth year Change existing Column s datatype: MODIFY COLUMN DateOfBirth date Change existing Column s Name and datatype: CHANGE COLUMN DateOfBirth YearOfBirth year Drop existing Column from table: DROP COLUMN degree Page 4 of 5
5 d. RENAME table Rename table syntax: RENAME TABLE tbl_name TO new_tbl_name RENAME TABLE faculty_tbl TO UT_FacultyTable e. DROP table Drop table form database. Drop table syntax: DROP TABLE UT_FacultyTable Part B: Hands-on by Students in Lab a. Create a table EmployeeTable in UT_Database database with following structure: i. EmpNo NOT NULL number, Primary Key, Auto Generated ii. EmpName VarChar(40) NOT NULL iii. Job NOT NULL Char(10) iv. DeptNo NOT NULL number v. PHONE_NO number vi. YearOfEnrollment year vii. Percentage float (two number, two decimal points) b. Add two more columns in EmployeeTable i. Address NOT NULL VARCHAR (20) ii. PostalAddress VARCHAR(100) c. Change column Job as Position datatype with VARCHAR(15) d. Change column PhoneNo with datatype VARCHAR (10) e. Delete column DeptNo from the table f. Finally, rename table with name UT_EmployeeTable Page 5 of 5
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