The ENUM data type allows you to specify a list of possible values that can be stored in a column. For example, a column specified as gender ENUM(‘male’, ‘female’) NOT NULL can have any of these values: ”, ‘male’ or ‘female’.
What data type is gender?
Categorical data represents characteristics. Therefore it can represent things like a person’s gender, language etc. Categorical data can also take on numerical values (Example: 1 for female and 0 for male).
What datatype is used in MySQL database?
In MySQL there are three main data types: string, numeric, and date and time.
How do you use gender in SQL?
Syntax: 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’)) ); Note: The check constraint in the above SQL command restricts the GENDER to belong to only the categories specified.
Is MySQL a binary?
The MySQL BINARY function is used for converting a value to a binary string. The BINARY function can also be implemented using CAST function as CAST(value AS BINARY). The BINARY function accepts one parameter which is the value to be converted and returns a binary string.
What data type is age?
Age can be both nominal and ordinal data depending on the question types. I.e “How old are you” is used to collect nominal data while “Are you the firstborn or What position are you in your family” is used to collect ordinal data. Age becomes ordinal data when there’s some sort of order to it.
What is the best data type for gender?
What is the recommended datatype for Gender? Char(1) sound better. I think Boolean might give problems for NULL data. Char(1) sound better.
What is difference between CHAR and varchar?
Storage size of VARCHAR datatype is equal to the actual length of the entered string in bytes.
Difference between CHAR and VARCHAR dataypes.
|1.||CHAR datatype is used to store character string of fixed length||VARCHAR datatype is used to store character string of variable length|
How do I type in MySQL?
- Numeric Data Type Syntax.
- Integer Types (Exact Value) – INTEGER, INT, SMALLINT, TINYINT, MEDIUMINT, BIGINT.
- Fixed-Point Types (Exact Value) – DECIMAL, NUMERIC.
- Floating-Point Types (Approximate Value) – FLOAT, DOUBLE.
- Bit-Value Type – BIT.
- Numeric Type Attributes.
- Out-of-Range and Overflow Handling.
How is gender set in database?
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. In medicine there are four genders: male, female, indeterminate, and unknown. You mightn’t need all four but you certainly need 1, 2, and 4.
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.
What are the DML commands?
Some commands of DML are:
- SELECT – retrieve data from the a database.
- INSERT – insert data into a table.
- UPDATE – updates existing data within a table.
- DELETE – deletes all records from a table, the space for the records remain.
- MERGE – UPSERT operation (insert or update)
- CALL – call a PL/SQL or Java subprogram.
What is varchar binary?
The BINARY attribute cause the binary collation for the column character set to be used, and the column itself contains nonbinary character strings rather than binary byte strings. When BINARY values are stored, they are right-padded with the pad value to the specified length.
What is a binary data type?
Store raw-byte data, such as IP addresses, up to 65000 bytes. Data types BINARY and BINARY VARYING ( VARBINARY ) are collectively referred to as binary string types and the values of binary string types are referred to as binary strings. A binary string is a sequence of octets or bytes.
What does binary mean in database?
Binary data is data whose unit can take on only two possible states, traditionally labeled as 0 and 1 in accordance with the binary numeral system and Boolean algebra.