Teradata - Data Manipulation


Rather than use an obvious Oasis hit like "Supersonic" or "Champagne Supernova," Manchester City players have traditionally walked onto the pitch to the old crooner song "Blue Moon. Noel often appears as a football pundit on British television and radio, and served as a friendly rival to former United captain and broadcaster Gary Neville.

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Gesamtmarktindizes sind dazu konzipiert das Marktgeschehen eines bestimmten Wirtschaftsraumes möglichst gut und in komprimierter Form wiederzugeben. Der abzubildende Wirtschaftsraum kann dabei ein Land, eine Region oder gar die ganze Welt sein.

Bei Branchenindizes stammen alle Indexmitglieder aus demselben Segment und weisen daher eine relativ hohe Korrelation im Vergleich zu Gesamtmarktindizes auf. Dadurch geht ein Teil des Diversifikationsvorteils eines Index verloren, vor allem wenn es ein marktdominierendes Unternehmen gibt, das aufgrund seiner hohen Marktkapitalisierung ein sehr hohes Gewicht im Index besitzt.

Regionen-Indizes bilden den Wirtschaftstrend von interessanten Regionen ab. Hierzu zählen natürlich Nordamerika und Europa, zu denen vor allem etablierte Industriestaaten gehören.

Aber auch für Regionen wie Südostasien, Osteuropa oder Lateinamerika werden Indizes aufgelegt, um an deren besonderer Wachstumsdynamik zu partizipieren. Strategieindizes beziehen sich in der Regel auf umfangreiche Kriterien zur Auswahl der Indexmitglieder. Here are the steps:. Once this is installed, you can verify the same by calling the installed. General workflow of the interaction with the database is very similar to a generic ODBC application workflow, and can be described with the following steps:.

First, in order to connect to a database, the RODBC package needs to be loaded with the library function. Then the connection has to be established. This can be done by either using the odbConnnect function or the odbcDriverConnect function.

In the following examples, ch is the channel to which this connection corresponds. It can be thought of as a connection handle. It can execute both types of SQL queries, ones which return a result set and the ones which do not return a result set. Here is an example of using the sqlQuery function to drop an existing employee table. To execute SQL statements, there are two methods — either we can use the function sqlQuery which behaves similarly to a standard SQLExecute method, or we can use two different function calls odbcQuery and sqlGetResults.

By calling the sqlQuery function, the query gets executed and the results are displayed on the R terminal. As USI column contains only unique values, no duplicate value is there in any subtable i. You will get to know little bit later. Suppose you have the below USI query-. Once the above query passes all the syntax and security check and Teradata optimizer finds that column associated with the where clause is an USI column, Teradata will fetch the record as below-.

It is obvious that NUSI value is duplicate and there could be huge number of duplicate values in it. So Teradata takes a different strategy to maintain subtable in this case. Each row of the subtable only tracks the base rows on the same AMP. This is what is meant by AMP Local.