How to Describe Table in Teradata

To get information about the table present in the database and find the attributes related to it we will use either DESCRIBE or DESC where both are Case Insensitive and produce a similar output. Retrieve the result rows using the following SQL cursor control statements.

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More specifically Im trying to display the definition of a view that is created from certain tables that I do not have SELECT or VIEW DEFINITION access to.

. DESCRIBE TABLE shows the columns related information in most of the popular RDBMS like ORACLE MySQL etc. In my Teradata SQL Assistant Client I can right-click a table and select Show Definition this will display the column types and how they are defined. In the absence of either the default title the column name is returned.

Then the title specified for the CREATE TABLE statement is returned. Table Commands. In most of the popular RDBMS like SQL Server Oracle MySQL etc we use truncate table statement to delete all the records from an existing table.

DESCRIBE is a Teradata extension to the ANSIISO SQL2011 standard. ALTER TABLE command is used to add or drop columns from an existing table. Syntax for Show table.

There is no Describe Table command available in Teradata. SHOW VIEW in XML Format. SELECT DATABASENAME TABLENAME SUM CURRENTPERM10242 AS CURRENT_MB SUM CURRENTPERM10243 AS CURRENT_GB FROM DBCALLSPACE WHERE DATABASENAME DATABASE_NAME AND TABLENAME TABLE_NAME GROUP BY 12 ORDER BY 12.

Objects in oracle might map to dbctables. CREATE SET TABLE database_nametable_name FALLBACK column_name data_type co. Whenever you are creating a table in Teradata you need to define the data types of each column.

Select from dbctables. You can use SHOW TABLE to display the table definition for a PTI table. Query SELECT DatabaseName TableName CreateTimeStamp LastAlterTimeStamp FROM DBCTablesV WHERE TableKind T and DatabaseName DBC ORDER BY TableName.

SHOW Table. Lists user-defined types UDTs in the current keyspace or all UDTs in the cluster when no keyspace is selected or the CQL definition for a specified UDT. Table Options Specifies the physical attributes of the table such as Journal and Fallback.

You can use either DESC or DESCRIBE statement. The syntax for deleting all records. Is there a query that can be run to give me the same output.

In teradata most metadata information is held in dbc. Unlike a SHOW IN XML TABLE request the XML document generated by a SHOW IN XML VIEW request does not report the parsed query for the view and only contains the column definitions of the view and the database objects it references. SELECT tablename columnname columntype columnformat columnlength Nullable columniddefaultvalue FROM dbccolumns.

This description is called the schema. Data types simply denote the type of data that we can store in any particular column. I have a table with 5 columns and suppose 100 rows in my table next day i have added the 10 rows again next day i have added 10 rows and again next day i have delete the 5 rows or update 5 rows then finally how we can find that what is the data change frequency in.

Assuming table1caseid is a byteint this will result in a product join. Can anyone describe that how we can find the Data change frequency in table or column. Some time we want to check the table definition such as number of columns data type of the columnprimary key unique constraints and so on.

They are as below. Query below lists all tables in DBC Teradata database. The DELETE TABLE statement will delete only records the table structure will remain the same.

For the last one. Shows a list of all tables in a keyspace or executable CQL information for a single table. DatabaseName - database name.

Datatype of the Column. Index Definition Additional indexing options such as Primary Index. This example returns the CREATE VIEW text for table user_namev1 in XML format.

Allocate storage for target variables to receive the returned data based on the demographics reported by DESCRIBE. Of course if this was a properly normalized table you could simple use a t1caseid t2caseid join instead. Each column in a table is associated with a data type.

Select t2datex t2caseid sum t1points from table1 as t1 join table2 a t2 on position trim t1caseid in t2caseid 0 group by 12. Query to get the Table size. DESCRIBE statement to get following information.

Teradata DELETE TABLE Syntax. The difference between the DELETE TABLE and the TRUNCATE TABLE is that here in the case of the TRUNCATE TABLE no transactional log is maintained for each deleted row. For complete information about SHOW TABLE syntax see Teradata Vantage SQL Data Definition Language Syntax and Examples B035-1144.

In that case SHOW table helps to get the table definition in Teradata. With database size precision and If NUMERIC datatype scale. FETCH cursor_name USING DESCRIPTOR SQLDA.

Column Definition Specifies the list of columns data types and their attributes. Teradata TRUNCATE TABLE. Column allow NULL or NOT NULL.

Teradata PT requires that the job script describe the structure of the data to be processed that is the columns in table rows or fields in file records. TableName - table name. Create one or more tables using the CREATE TABLE statement.

CREATE TABLE command is used to create tables in Teradata. Teradata DELETE TABLE statement removes all the records from a Teradata table. Both are return same result.

In this step results tables are examined one row at a time using the selection. Below are the syntax of Teradata HELP TABLE and. DROP TABLE command is used to drop a table.

SQL DESC statement use for describe the list of column definitions for specified table. The output includes the system generated TD_TIMEBUCKET TD_TIMECODE and TD_SEQNO columns for PTI Tables. The following procedure shows how to create tables using BTEQ but you can also use Teradata Studio.

DESCRIBE functions like the ANSIISO SQL2011 statements DESCRIBE INPUT and DESCRIBE OUTPUT. For example for storing string data like James into a column we need to define a column as char or varchar. Logon on to Teradata Database as user DBADMIN using BTEQ.

Schemas are created using the DEFINE SCHEMA statement. Teradata provides two alternative ways to view the columns related information. If we want to show the structure of a database table or tables in the server then we will use the SQL command DESCRIBE or other keyword DESC which is identical to DESCRIBE one.

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