Teradata allows 32 LOB columns.
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Thursday, 8 September 2016
Saturday, 3 September 2016
How many columns we can have as Foreign & Parent Key?
We can have 16 Columns in Foreign
& Parent key.
How many per table referencail constraints we can have in Teradata?
We can have 64 Referential constraints per
table.
How many per table constratints per table we can have in Teradata?
We can have 100 Table level
constraints per table.
How many seconday / join indexes we can have in Teradata?
We can have 32 Secondary / Join
indexes per table.
What is the maximum length of the column name or table name in Teradata?
We can have 30 Characters as Column /
Table name length.
Here are 5 frequently asked questions (FAQs) about the maximum length of column names or table names in Teradata:-
1. What is the maximum length of a column name in Teradata?
- The maximum length of a column name in Teradata is 30 characters. Column names exceeding this length will result in an error when attempting to create or modify a table.
2. What is the maximum length of a table name in Teradata?
- Similarly, the maximum length of a table name in Teradata is also 30 characters. Table names that exceed this length will generate an error during table creation or renaming operations.
3. Why does Teradata impose a maximum length for column and table names?
- Teradata imposes a maximum length for column and table names for compatibility and efficiency reasons. Keeping names within a reasonable length helps ensure interoperability with various client applications, tools, and standards. Additionally, shorter names contribute to better performance and readability in SQL queries and metadata.
4. Can I use special characters or spaces in column or table names to bypass the length restriction?
- No, Teradata does not allow the use of special characters or spaces in column or table names. Names must consist of alphanumeric characters and underscores only, and they must begin with a letter. Attempting to use special characters or spaces will result in an error, regardless of length.
5. What should I do if I need longer column or table names in Teradata?
- If you require longer and more descriptive names for columns or tables, consider using abbreviations or alternative naming conventions that convey the necessary information within the 30-character limit. Additionally, you can use comments or metadata annotations to provide additional context for columns and tables without sacrificing readability or compatibility.
These FAQs should provide a clear understanding of the maximum length limitations for column names and table names in Teradata and how to work within those constraints effectively.