What data type is gender?
8 Answers. Per the standard, the column should be called “Sex” and the ‘closest’ data type would be tinyint with a CHECK constraint or lookup table as appropriate.
How do you do gender in SQL?
Learn SQL for interviews using SQL Course by GeeksforGeeks. CREATE TABLE pets( ID INT NOT NULL, Name VARCHAR(30) NOT NULL, Breed VARCHAR(20) NOT NULL, Age INT, GENDER VARCHAR(9), PRIMARY KEY(ID), check(GENDER in (‘Male’, ‘Female’, ‘Unknown’)) );
Is gender Boolean or character?
However, any character, whether text, number, special or control, can be stored in this data type. Any piece of information that can have two and only two choices should be declared as data type Boolean. For example, GENDER should be Boolean because there are only two choices.
How do you create a gender field in a database?
You can use a FOREIGN KEY to a reference table with just 2 rows: CREATE TABLE Gender_Ref ( gender CHAR(1) NOT NULL, PRIMARY KEY (gender) ) ENGINE = InnoDB ; INSERT INTO Gender_Ref (gender) VALUES (‘F’), (‘M’) ; CREATE TABLE members ( id int(11) NOT NULL auto_increment, … …
What data type is name?
|Data type||Type name||Description|
|big integer||big integer bigint int64||Whole numbers between -9,223,372,036,854,775,806 and 9,223,372,036,854,775,806|
|decimal||decimal dec real double||64-bit floating-point values|
|text||text alpha||String values that contain uppercase and lowercase letters, numbers, spaces, and symbols|
How do you declare a gender in Java?
First of all, in your if statements, you’re assigning the value of f and m to gender with a single = operator. You need to do if (gender == true) or if (gender == false). Also, I recommend having true represent male or female and false represent the other gender.
Can we change column name in SQL?
It is not possible to rename a column using the ALTER TABLE statement in SQL Server. Use sp_rename instead. To rename a column in SparkSQL or Hive SQL, we would use the ALTER TABLE Change Column command.
What are SQL data types?
Data types in SQL Server are organized into the following categories:
- Exact numerics. Unicode character strings.
- Approximate numerics. Binary strings.
- Date and time. Other data types.
- Character strings.
- bigint. numeric.
- bit. smallint.
- decimal. smallmoney.
- int. tinyint.
What is character data type?
The CHAR data type stores character data in a fixed-length field. Data can be a string of single-byte or multibyte letters, numbers, and other characters that are supported by the code set of your database locale. … The size of a CHAR column is byte-based, not character-based.
What data type is Boolean?
In computer science, the Boolean data type is a data type that has one of two possible values (usually denoted true and false) which is intended to represent the two truth values of logic and Boolean algebra.
What is enum data type in mysql?
An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time.
What is unique key SQL?
A unique key is a set of one or more than one fields/columns of a table that uniquely identify a record in a database table. You can say that it is little like primary key but it can accept only one null value and it cannot have duplicate values.