Datatypes in Oracle:
   Datatypes are used to the table columns.

1. char<size>
2. varchar2(<size>) OR varchar(<size>)
3. date
4. number
5. decimal
6. long
7. long raw
8. BLOB
9. CLOB
10. NCLOB
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1. char<size>:
-It is a fixed length datatype.
-It accepts character of length 255 digits
-It is right padded with space
-Size indicates how many digit of character the column should accept.
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2. varchar2(<size>) OR varchar(<size>)
-It is a variable length datatype
-It accepts character of length 4000 digits
-It accepts character & alpha-numeric character
-It is not right padded with space
-Size indicates how many digit character the column should  accept.
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3. date: It is used for date and time values
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4. number: It is used for both fixed and floating numbers
   Fixed number: number(4)
   Floating number: number(7,2)
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5. decimal: It is used for floating numbers
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6. LONG: It is variable length datatype of 2 GB size. It accepts characters, alpha-numeric characters.
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7. LONGRAW: It accepts binary values
Ex: Images, binary files etc
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8. BLOB:
The BLOB data type stores binary large objects. BLOB can store up to 4 gigabytes of binary data.
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9. CLOB:
This data type stores character large objects. CLOB can store up to 4 gigabytes of character data.
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10. NCLOB:
This data type stores character large objects in multibyte national character set. NCLOB can store up to 4 gigabytes of character data.
