Posts (page 46)
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4 min readTo tokenize a string by delimiters in Teradata, you can use the STRTOK function. This function allows you to specify a delimiter and extract tokens from a given string.
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5 min readIn Teradata, an inefficient query can be identified by looking out for certain indicators such as slow response time, high CPU and IO usage, and excessive use of resources. One way to determine if a query is inefficient is by analyzing the Explain plan to understand the execution path and steps involved in running the query. An inefficient query may involve unnecessary full table scans, lack of proper indexing, excessive joins, and suboptimal query structure.
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5 min readTo select multiple date ranges in Teradata SQL, you can use the "BETWEEN" keyword along with the "OR" operator. This allows you to specify multiple date ranges in your query to fetch data that falls within those ranges. You can also use the "IN" operator to specify a list of specific dates or ranges that you want to select from your data.
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4 min readIn Teradata stored procedures, you can declare a variable of a rowtype by specifying the table structure in the DECLARE statement.
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5 min readTo identify a query that returns a result set in Teradata, you can look for specific keywords and syntax that indicate the query is selecting or retrieving data from a table. This includes keywords such as SELECT, FROM, WHERE, GROUP BY, HAVING, and ORDER BY. Additionally, functions and clauses that filter, aggregate, or manipulate data can also suggest that a query is returning a result set.
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8 min readTo execute a query present as text in Teradata, you can use Teradata SQL Assistant or a similar tool that allows you to input and run SQL queries directly. Simply paste the query into the SQL editor, ensure it is properly formatted and syntactically correct, and then click the 'Execute' or 'Run' button to run the query against the Teradata database. Make sure you have the necessary permissions and access to the database before executing the query.
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3 min readTo convert strings to a 'mm/dd/yyyy' format in Teradata, you can use the following SQL statement:SELECT TO_DATE(your_string_column, 'YYYY-MM-DD') AS converted_date FROM your_table;This SQL statement uses the TO_DATE function in Teradata to convert the string in the specified format (YYYY-MM-DD) to a date data type. You can then use additional functions or formatting options to display the date in the desired 'mm/dd/yyyy' format.
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2 min readTeradata compiles non-printable characters by representing them using specific escape sequences. This allows the system to store, process, and display these characters without any issues. These escape sequences are special codes that represent the non-printable characters in a readable format for the system to understand.
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5 min readTo get the maximum column values across a row in Teradata SQL, you can use the GREATEST function. This function takes multiple arguments and returns the greatest value among them. You can pass in the column names as arguments to the GREATEST function to get the maximum value across those columns in a row.For example:SELECT GREATEST(column1, column2, column3) AS max_value FROM your_table;This query will return the maximum value among column1, column2, and column3 for each row in the table.
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6 min readTo create a trigger for on update timestamp in a Teradata table, you first need to define the trigger and its behavior using SQL statements. You can do this by writing a CREATE TRIGGER statement that specifies the table you want to add the trigger to, the type of trigger you want to create (BEFORE UPDATE or AFTER UPDATE), and the code you want the trigger to execute.
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2 min readTo add a date in Teradata, you can use the DATE data type along with the DATE literal format. You can simply create a new column in a table with the DATE data type and then insert a date value in the YYYY-MM-DD format using the DATE function. You can also use the TO_DATE function to convert a string representation of a date into the DATE data type.
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5 min readTo convert a column in seconds to date format in Teradata, you can use the following SQL query:SELECT DATE '1970-01-01' + (your_column_name / (606024)) AS new_date_column_name FROM your_table_name;In this query, replace "your_column_name" with the name of the column containing the seconds, "new_date_column_name" with the desired name for the new date column, and "your_table_name" with the name of the table where the column is located.