teradata

What is the difference between "TOP" and "SAMPLE" in TeraData SQL? Are they the same? From TOP vs SAMPLE : TOP 10 means "first 10 rows in sorted order". If you don't have an ORDER BY, then by extension it will be interpreted as asking for "ANY 10 rows" in any order. The optimizer is free to select the cheapest plan it can find and stop processing as soon as it has found enough rows to return. If this query is the only thing running on your system, TOP may appear to always give you exactly the same answer, but that behavior is NOT guaranteed. SAMPLE, as you have observed, does extra processing

Is it possible to transfer the date from the Teradata Table into .csv file directly. Problem is - my table has more that 18 million rows. If yes, please send tell me the process For a table that size I would suggest using the FastExport utility. It does not natively support a CSV export but you can mimic the behavior. Teradata SQL Assistant will export to a CSV but it would not be appropriate to use with a table of that size. BTEQ is another alternative that may be acceptable for a one-time dump if the table. Do you have access to any of these? Syed Ghazanfer I use the following code to export

I am trying to connect to Teradata with c#. I am using the sample code from this website using System; using System.Collections.Generic; using System.Text; using Teradata.Client.Provider; namespace Teradata.Client.Provider.HelloWorld { class HelloWorld { static void Main(string[] args) { using (TdConnection cn = new TdConnection("Data Source = x;User ID = y;Password = z;")) { cn.Open(); TdCommand cmd = cn.CreateCommand(); cmd.CommandText = "SELECT DATE"; using (TdDataReader reader = cmd.ExecuteReader()) { reader.Read(); DateTime date = reader.GetDate(0); Console.WriteLine("Teradata Database

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Is it possible to transfer the date from the Teradata Table into .csv file directly. Problem is - my table has more that 18 million rows. If yes, please send tell me the process 回答1: For a table that size I would suggest using the FastExport utility. It does not natively support a CSV export but you can mimic the behavior. Teradata SQL Assistant will export to a CSV but it would not be appropriate to use with a table of that size. BTEQ is another alternative that may be acceptable for a one-time dump if the table. Do you have access to any

I am trying to produce a results table with the last completed course date for each course code, as well as the last completed course code overall for each employee. Below is my query: SELECT employee_number, MAX(course_completion_date) OVER (PARTITION BY course_code) AS max_course_date, MAX(course_completion_date) AS max_date FROM employee_course_completion WHERE course_code IN ('M910303', 'M91301R', 'M91301P') GROUP BY employee_number This query produces the following error: 3504 : Selected non-aggregate values must be part of the associated group If I remove the MAX() OVER (PARTITION BY...)

I'm trying to query a Teradata database in Python with PyODBC. The connection to database is established alright; however, when I try to fetch result, I ran into this error "Invalid literal for Decimal: u''". Help please. I am on RHEL6, with Python 2.7.3 Here is the code and result: import pyodbc sql = "select * from table" pyodbc.pooling = False cnx = pyodbc.connect("DRIVER={Teradata};DBCNAME=host;DATABASE=database; AUTHENTICATION=LDAP;UID=user;PWD=password", autocommit=True, ANSI=True) cursor = cnx.cursor() rows = cursor.execute(sql).fetchone() InvalidOperation Traceback (most recent call