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Is there a difference between default values of column in PostgreSQL? Whether this is important?
state character varying(255) DEFAULT NULL
and
state character varying(255) DEFAULT NULL::character varying
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In PostgreSQL basically varying is the alias name of varchar, so there is only one difference between character varying and varchar is character varying more friendly than varchar in PostgreSQL.
2) PostgreSQL Varchar Data Type. The PostgreSQL Varchar data type is used to store characters of indefinite length based on the parameter n. It can store a string up to 65,535 bytes long. In the PostgreSQL Varchar data type i. e. Varchar(n), n is used to denote the character length limit.
PostgreSQL supports a character data type called TEXT. This data type is used to store character of unlimited length. It is represented as text in PostgreSQL. The performance of the varchar (without n) and text are the same. Syntax: variable_name TEXT.
The CHARACTER VARYING data type stores a string of letters, digits, and symbols of varying length, where m is the maximum size of the column (in bytes) and r is the minimum number of bytes reserved for that column.
There is no effective difference in the presented example in a standard installation.
Without explicit cast, NULL of data type unknown will be coerced to varchar in an assignment cast automatically. See:
In other situations, where the type cannot be derived from context, you may need to cast explicitly - to tell Postgres the intended type of the value. This is rarely the case, though.
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