nzsql Archives - Page 4 of 5

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

Netezza

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

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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

Netezza

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

Netezza

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

Netezza

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

Netezza

Netezza System Tables and Views

There are lot of Netezza system tables and views views available. You can get the more information about the users, tables, synonyms etc. Read: Netezza data types and length restrictions Netezza Query History details using nz_query_history Table Netezza System Tables and Views Below are the list of some commonly used system tables and views: View Table Description _v_sys_columns Return a list of all columns of table available in database. This is very important system view that can be used to search columns. _v_aggregate _t_aggregate Returns a list of all defined…

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September 4, 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

General

Quick and best way to Compare Two Tables in SQL

Say you have requirement to compare two tables. You have two tables in same database or server that you wish to compare, and check if any changes in the column values or see if any row is missing in either of tables. Below are some of the methods you can use to compare two tables in SQL. Compare Two Tables using UNION ALL UNION allows you to compare data from two similar tables or data sets. It also handles the NULL values to other NULL values which JOIN or WHERE…

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August 29, 2016