What are the 12 data types of the database?

The 12 data types are: 1. Character types include varchar2, nvarchar2, char, nchar and long; 2. Numeric types include number (p, s) and float; 3. Date types include date and timestamp; 4. Other types include blob, clob and bfile.

The operating environment of this tutorial: windows7 system, Dell G3 computer, oracle version 11.2.0.1.0.

1. Character type:

2. Number type:

number (p,s): The maximum precision of p is 38 bits (decimal) p represents the precision, and s represents the number of decimal places to be retained; it can be used to store fixed-length integers and decimals

float: used The precision of storing 126-bit data (binary) is calculated in binary, and the precision range is binary 1~126. When converting to binary, it needs to be multiplied by 0.30103

3. Date type:

date: Used to store date and time, accurate to seconds

timestamp: The date displayed is more accurate than date, accurate to decimal seconds, and can also display morning or afternoon

4. Other data types:

blob: can store up to 4GB of binary data

clob: can store up to 4GB of string data

bfile: The size is related to the operating system. It is used to store unstructured binary data in operating system files outside the database.

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