Netezza Analytical Functions Archives

Netezza User Defined Functions and Sample Examples

The Netezza user defined functions feature allows you to create custom functions, aggregates, and shared libraries that run on Netezza systems and perform specific types of analysis for your business reporting and data query using those UDFs. The Netezza user defined functions allows you to make use of the Netezza massively parallel processing (MPP) environment to accelerate or speed up your data analysis, as well as to offer new and unique types of analysis on you tera byte of data. Read: Netezza Advance Analytics Functions Netezza String Functions and Examples…

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November 25, 2016

Netezza

Netezza group_concat alternative Working Example

If you are trying to concatenate column values after grouping them in Netezza database, you would be searching for Netezza group_concat alternative function. A Netezza group_concat is a UDF provided by the IBM. You have to take that C++ code and compile it on Netezza host to make use of that function. To compile the code you should be either nz user or Netezza admin. You have to compile the source code to new Netezza host in case if you migrate the data from one Netezza server to another. Read:…

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November 15, 2016

General

Netezza Cumulative Sum, Average and Example

You can make use of the Netezza analytical functions to calculate the cumulative sum or running sum. Sum and Average analytical functions are used along with window options to calculate the Netezza cumulative sum or running sum. Read: Identify and Remove Netezza Duplicate Records in Table IBM Netezza Extract Numbers from String Examples Netezza Pivot Rows to Column With Example Netezza Update Join Syntax and Examples Netezza Recursive Query Alternative and Examples IBM Netezza Rollup Group Aggregates using Grouping sets Netezza Cumulative Sum, Average Syntax: Below are the Syntax for…

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November 5, 2016

Netezza

Netezza ROWNUM Pseudo Column Alternative

If you are coming from Oracle database background, you will find it difficult in Netezza without ROWNUM pseudo column. The one possible solution to this is ROW_NUMBER() analytical function as Netezza ROWNUM pseudo column alternative. You can use ROW_NUMBER analytic function as a Netezza ROWNUM equivalent. I think most of the distributed databases does not provide the ROWNUM columns. There is a LIMIT clause to restrict the output but very difficult to assign the sequential numbers to the rows in the Netezza tables. Even Netezza Sequences also does not produce…

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October 16, 2016

Netezza

Netezza Advanced Date Functions and Examples

Netezza Advanced Date Functions are available in Netezza SQL extensions tool kit. You have to download it from IBM fix central and install it in required database. You cannot access these functions otherwise. Read: how to download and Install Netezza SQL extensions toolkit These advanced functions are different than standard Netezza data time functions. You can read about the standard Netezza date functions from below post: Netezza Data Functions and Examples You may want to read: nzsql command and its Usage Netezza Analytics Functions and Examples IBM Netezza Conversion Functions…

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September 24, 2016

Netezza

Netezza String Functions and its Usage with Examples

Netezza String Functions are used primarily for string manipulation. An IBM Netezza also supports some of the standard string function along with the PostgreSQL specific functions. Netezza String Function Usage Below is the list of Netezza String functions supported: Function Name Description ascii(s) Returns the numeric ASCII value of the first character in the text string. btrim(s) Trims spaces from both ends of the string. btrim(s,t) Trims occurrences of the characters in string t from bothe ends of string s chr(n) Returns the character with the specified ASCII value. initcap(s) Capitalizes the…

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September 21, 2016

Netezza

Netezza Extract Function Usage and Examples

Netezza extract function extracts the sub field represented by units from the date/time value, interval, or duration specified for column. This function is equivalent to Netezza date_part() function. Netezza Extract Function Syntax extract(units FROM col) Netezza Extract Function Usage Below table represents the descriptions of the different units used in extract function: Unit Value Description epoch The number of seconds since 1970-01-01 00:00:00-00. The value can be positive or negative. millennium/millenniums The millennium value. century/centuries The number of full 100-year periods represented by the year. decade/decades The number of full 10-year periods represented by the…

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September 20, 2016

Netezza

Netezza Date Functions and Examples

This article is about detailed descriptions and examples of the standard Netezza date functions that you can use to manipulate date columns in the Netezza SQL and Netezza stored procedure. In the real word scenarios many application manipulate the date and time data types. Date types are highly formatted and very complicated. Each date value contains the century, year, month, day, hour, minute, and second. Each RDBMS may employ different date functions, and there may also be differences in the syntax for each RDBMS even when the function call is the…

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August 31, 2016

Netezza

Netezza Analytic Functions

Netezza analytic functions compute an aggregate value that is based on a group of rows. A Netezza SQL analytic function works on the group of rows and ignores the NULL in the dat. Netezza server is basically an analytics system and provides many useful functions that can perform day to day aggregations. As these functions are native to Netezza server, hence use of these Netezza analytic functions improves performance of SQL queries as well as server performance. Frequently used Netezza analytical functions are as follows: COUNT Analytic Function Returns the number of…

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August 17, 2016