Netezza

Netezza Hash Function Usage and Examples

You can use Netezza hash function to encode the data by transforming the input into a hash code or hash values. If you use the hash function, no two inputs have same hash values. The hash algorithm is designed to minimise the collision (two inputs having same hash value). You can use the hash function to speed up the data record retrieval by using simple one way lookup. Hash code is used as an index into a hash table which has a pointer to data records. Netezza hash function also…

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September 14, 2016
Netezza

Netezza Correlated Subquery and its Restrictions

Netezza Correlated subquery is a query within a query that refer the columns from the parent or outer query. Netezza does support the regular and correlated subqueries. In most cases, the Netezza correlated subqueries are used to improve the SQL query performance. Netezza Correlated Subquery Example For example, consider query, “check if department is already exists in the patient table before selecting it from patient department table”. We can correlate both tables and write sql query. You can write the SQL as below: SELECT T1.DEPT_CD , DATA_SRC_CD , T1.DEPT_NM FROM…

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September 14, 2016
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Download and Configure Netezza Linux ODBC Driver

This section describes you about downloading, configuring and testing Netezza Linux ODBC driver. This process is tested on the Ubuntu 14.04. Netezza Linux ODBC Drivers are requires to connect to Netezza server from any client machine. Read: Install vmware player and Netezza emulator on Ubuntu Connecting Netezza using Python pyodbc - Working ExampleNetezza FPGA nzsql Command and its Usage nzload command and its Usage Download Netezza Linux ODBC Driver You can download Netezza Linux ODBC Driver from Netezza fix central page. Below is url for your reference: https://www-945.ibm.com/support/fixcentral/ Note that, IBM…

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September 14, 2016
Netezza

Netezza Synonyms Best Practices and Examples

Netezza synonyms allow you to create easily typed names (you can remember and type easily) for long table, view names, or any other objects. You can create SQL synonyms as an alternate way of referencing tables or views that present in the current or other databases on the Netezza same system. Netezza Synonyms allow you to create another level of abstraction for the database objects (tables, views) and that allows and enable you to swap the underlying database objects without modifying the code that references these objects. You can even…

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September 13, 2016
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Netezza WITH Clause Syntax and Examples

If you have requirement to reuse the piece of query result in same query, then you can use the Netezza WITH clause. You can also use the WITH clause to improve the speed for Netezza complex sub-queries and improve overall performance. This is also called the sub query factoring and you can use it when sub query is called multiple times. You can use the WITH Clause command to run multiple sub queries in a SELECT statement. The main advantage of Netezza WITH clause is, you can use it wherever…

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September 12, 2016
General

Netezza Pivot Rows to Column With Example

There may be a situation you may want PIVOT rows to column and vice versa. Netezza don't have PIVOT function like other RDBMS. Netezza Pivot rows to column and column to row requires the CASE or DECODE statements. Netezza PIVOT Rows to Column Let us consider the below input data TRAINING.ADMIN(ADMIN)=> select * from students; CLASS | SECTION | PASS_FAIL | COUNT --------+---------+-----------+------- CLASS2 | B | FAIL | 333 CLASS2 | B | PASS | 543 CLASS1 | A | FAIL | 123 CLASS1 | A | PASS |…

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September 11, 2016
Netezza

How to use Netezza Replace Function and Examples

By default, there is no Netezza replace function. Replace function is very much needed in case if you are manipulating strings and there is a need to replace the particular value when displaying reports. Netezza provides replace function in the Netezza SQL extensions toolkit that administrator has to install and grant permission to use. Netezza Replace Function The Netezza replace() function replaces each instance of a pattern in the input with the value in the string replacement. Syntax: The replace() function has the following syntax: REPLACE(varchar input, varchar pattern, varchar…

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September 10, 2016
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Netezza Set Operators:UNION, MINUS and INTERSECT

You can use the Netezza set operators to combine similar data sets from two or more SELECT statements. Here the similar data set literally mean, the data type of the result set should also match, otherwise you have to explicitly type cast data when using Netezza set operators. Read: nzsql command and usage nzload command and usage Types of Netezza Set Operators Netezza supports the three types of set operators: UNION [DISTINCT] and UNION ALL INTERSECT [DISTINCT] EXCEPT [DISTINCT] or MINUS [DISTINCT] Netezza Set Operators Syntax: Below is the general…

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September 10, 2016
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Download and Install Netezza SQL Extensions Toolkit

The Netezza SQL Extensions toolkit is an optional package that contains additional SQL functions for IBM Netezza data warehouse appliances. The Netezza SQL Extensions toolkit contains various functions and regular expressions that are useful in day to day computations. You can download this package from the IBM site and install to particular database. Read: Netezza Advanced Date Functions and Examples dasdas Download the Netezza SQL Extensions Toolkit Login to IBM fix central site given below and download sql-ext-version.tar.gz file. Download Extension toolkit here Once the software is downloaded copy that…

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September 9, 2016
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Netezza Dynamic SQL Queries and Examples

There may be situation where you want to generate Netezza dynamic SQL queries inside your Netezza NZPLSQL procedures. Or, you may have procedures that  generates other procedures or CREATE TABLE or update the records form the table based on some condition. You can also set some session specific variables dynamically inside the stored procedure and execute the queries. For such situations, Netezza NZPLSQL provides the “EXECUTE IMMEDIATE” statement. You can execute the Netezza dynamic SQL queries only in stored procedures. You cannot execute the queries within Netezza block statements. Read:…

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September 9, 2016