# Base tools
**Dependencies**
Assumes Teradata >=17.20.
**Base** tools:
- base_readQuery - runs a read query
- base_tableDDL - returns the show table results
- base_databaseList - returns a list of all databases
- base_tableList - returns a list of tables in a database
- base_columnDescription - returns description of columns in a table
- base_tablePreview - returns column information and 5 rows from the table
- base_tableAffinity - gets tables commonly used together
- base_tableUsage - Measure the usage of a table and views by users in a given schema
**Base** Prompts:
- base_query - Create a SQL query against the database
- base_tableBusinessDesc - generates a business description of a table
- base_databaseBusinessDesc - generates a business description of a databases based on the tables
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