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When you create a table with a VARCHAR2 column, you must specify the Since Oracle Database 12c, you can specify the maximum size of 32767 for the first name exceeds the maximum length of the first_name column, Oracle issued the 11 Nov 2011 Oracle database object names maximum length is 30 bytes. I'm working on Oracle 12c 12.1. However, doesn't seem like it allows more than 30 characters for column/table names. In 12c although the all_tab_columns do say VARCHAR2(128) for Table_Name, it does not allow more than 30 bytes name. Database SQL Language Reference .. marks and periods is a single-byte character, so the total length of the identifier in this example can be up to 98 bytes. 14 Apr 2014 In Oracle Database 12cR2, the maximum length of most identifiers is now 128 versions of the database, you will need to avoid using long identifier names, Naming standards most probably won't affect database performance although Table names are in plural form, for example, persons, materials, addresses. This Oracle tutorial explains how to use the Oracle CREATE TABLE "null" or "not null" and if this value is left blank, the database assumes "null" as the default. as a number datatype (maximum 10 digits in length) and can not contain null values. Create an Oracle table called suppliers that stores supplier ID, name, and I am creating a table dynamically whose one column name exceeds more than As of Oracle Database 12.2, the maximum length of names increased to 128 26 Nov 2018 Query below lists: (A) tables' columns, along with their name's length. All tables accessible to the current user in Oracle database. (B) tables' In this data tutorial, we'll examine Oracle data dictionaries and the SQL commands to and look through the actual table list and ownership of your database. so you may wish to limit your query by specifying an appropriate owner , like so:.