Blog

To get the total size in bytes for a particular table in Teradata, you can use the SQL query:SELECT SUM(CurrentPerm) FROM DBC.TVFields WHERE DatabaseName='<database_name>' AND TableName='<table_name>';This query will return the total size in bytes for the specified table by summing up the CurrentPerm column from the DBC.TVFields system table for that table in Teradata.What is the SQL function to retrieve the size of a table in Teradata.

To select only rounded amounts in SQL Teradata, you can use the ROUND function to round the amounts to the desired precision. For example, if you want to display amounts rounded to the nearest whole number, you can use the ROUND function with a precision of 0.You can also use the FLOOR or CEILING functions to round amounts down or up to the nearest whole number, respectively. Additionally, you can use the TRUNC function to remove the decimal part of the amounts without rounding.

To insert Excel rows into a Teradata table, you can do the following:Firstly, ensure that the Excel file and the Teradata table have the same column structure, with matching data types.Export the Excel file to a CSV format.Use a Teradata SQL Assistant or another tool to connect to the Teradata database.Use the "INSERT INTO" statement to insert the data from the CSV file into the Teradata table. You can use the Teradata SQL Assistant's import wizard to help with this process.

To delete a part of a value from a column in Teradata SQL, you can use the UPDATE statement with the SUBSTRING function.

To calculate the mean value per group in Teradata SQL, you can use the AVG function along with the GROUP BY clause.First, you need to specify the column that you want to calculate the mean value for in the AVG function. Then, you need to group the data based on a specific column using the GROUP BY clause.

To see all the views under a schema in Teradata, you can use SQL queries to query the Data Dictionary views to retrieve the information. You can query the "dbc.tables" view with the appropriate filter conditions to only select views and views that belong to a specific schema. Additionally, you can query the "dbc.views" view to get more specific information about the views such as the SQL definition of the view.

To make importing data faster in Teradata, one can follow several best practices. First, it is important to ensure that the data being imported is in a format that is conducive to fast loading. This includes using delimited files, such as CSV or TSV, rather than fixed-width files. Additionally, optimizing the data file by removing unnecessary columns or rows can also help improve import speed.

To combine three variables into a date format (mm/dd/yyyy) in Teradata, you can use the CONCAT function to concatenate the variables together.For example, if you have three variables for month (mm), day (dd), and year (yyyy), you can combine them into a date format by using the following SQL query: SELECT CONCAT(month,'/',day,'/',year) AS date FROM your_table_name;This will combine the month, day, and year variables into a single date column in the format mm/dd/yyyy.

To convert a string into a timestamp(0) in Teradata, you can use the CAST function with the appropriate format. For example, if your string is in the format 'YYYY-MM-DD HH:MI:SS', you can use the following query:SELECT CAST('2021-09-28 14:30:00' AS TIMESTAMP(0) FORMAT 'YYYY-MM-DDBHH:MI:SS');This query will convert the string '2021-09-28 14:30:00' into a timestamp(0) format in Teradata. Make sure to adjust the format according to the format of your string.

To perform numerical value comparison in Teradata SQL, you can use comparison operators such as "=", "<>", ">", "<", ">=", "<=", etc. These operators are used to compare numerical values in different columns or tables. You can also use logical operators such as AND, OR, and NOT to combine multiple comparison conditions. Additionally, you can use functions such as CASE, COALESCE, and NULLIF to handle NULL values during comparisons.