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I want to create a table whose field name is of 100 characters but postgres limit for no of characters is 64 so how to change that limit to 100?
example: Create table Test ( PatientFirstnameLastNameSSNPolicyInsuraceTicketDetailEMRquestionEMR varchar(10) )
This table creation fails as the name exceeds 64 characters
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How to increase the length of a character varying datatype in Postgres without data loss. Run the following command: alter table TABLE_NAME alter column COLUMN_NAME type character varying(120); This will extend the character varying column field size to 120.
The syntax to modify a column in a table in PostgreSQL (using the ALTER TABLE statement) is: ALTER TABLE table_name ALTER COLUMN column_name TYPE column_definition; table_name. The name of the table to modify.
It is acceptable to use spaces when you are aliasing a column name. However, it is not generally good practice to use spaces when you are aliasing a table name. The alias_name is only valid within the scope of the SQL statement.
PostgreSQL tables are hard-limited to a maximum of 1600 columns.
Actually name's limit is equal to NAMEDATALEN - 1 bytes (not necessarily characters), default value for NAMEDATALEN is 64.
NAMEDATALEN was determined at compile time (in src/include/pg_config_manual.h). You have to recompile PostgreSQL with new NAMEDATALEN limit to make it work.
However think about design and compatibility with other servers with standard 63 bytes limit. It's not common practice to use such long names.
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It's because of the special name type (see table 8.5), which is used in pg_catalog. It won't accept anything longer than 63 bytes (plus terminator). There is no workaround.
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