This document summarizes some common PostgreSQL data types including: - Integer, Bigint, Boolean, Varchar, Char, Double Precision, Serial, and Text for storing different data like IDs, names, amounts, flags and more. It also explains that the Serial data type automatically increments integer primary keys and is equivalent to using a sequence. Finally it requests users to like the Baabtra Facebook page if they found the presentation helpful.

2. Disclaimer: This presentation is prepared by trainees of
baabtra as a part of mentoring program. This is not official
document of baabtra –Mentoring Partner
Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt .
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3. DATA TYPES
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4. Data Types
• PostgreSQL has a rich set of native data types
available to users. Users may add new types
to PostgreSQL using the CREATE TYPE command.
•Integer : signed four-byte integer
•-int_Hotel_id int
• Bigint : Signed eight-byte integer
-bint_Cust_id bigint
• Boolean: logical Boolean (true/false)
-bln_permission boolean

5. •Varchar(n): variable-length character string
-vchr_Cust_name varchar(30)
•char(n):fixed-length character string
-Chr_Cust_type char(5)
•double precision: double precision floating-
point number
–Dbl_amount doubl precision
•Serial: autoincrementing four-byte integer
–Pk_int_id int serial
•Text-variable: length character string

6. CREATE TABLE tablename (
colname SERIAL
);
SERIAL
This is the same as
CREATE TABLE tablename (
colname DEFAULT NEXTVAL (‘seq_name’))

7. Double precision Data type
•It stores decimal values.
•Storage size 8 bytes
•Range 15 decimal digit precision
•For eg. (Dbl_salary double precision)

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