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Netezza Foreign Key Constraint and Syntax

Netezza nzsql supports SQL-92 standard. Netezza data warehouse appliance supports referential integrity such as Netezza foreign key, primary key, and unique keys as part of SQL-92 standard requirement. You can create Netezza foreign key constraint while creating tables in Netezza database but it will not be enforced while loading Netezza tables. Read: Netezza nzsql command and its Usage Netezza Unique Key Constraint and Syntax Netezza Primary Key Constraint and Syntax In this post we will learn about the Netezza foreign key constraints and its syntax. Netezza Foreign Key Constraint Syntax and…

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November 19, 2016

Netezza

Netezza Primary Key Constraint and Syntax

Netezza nzsql supports SQL-92 standard. Netezza data warehouse appliance supports referential integrity such as Netezza primary key, foreign key, and unique keys as part of SQL-92 standard requirement. You can create Netezza primary key constraint while creating tables in Netezza database but it will not be enforced while loading Netezza tables. Read: Netezza Create Table Command and Examples Netezza Unique Key Constraint and Syntax Netezza Foreign Key Constraint and Syntax In this post we will learn about the Netezza primary key constraints and its syntax. Netezza Primary Key Constraint Syntax…

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November 19, 2016

Netezza

Netezza LEFT and RIGHT Functions

If you are migrating to Netezza from other relational databases such as Oracle, SQL Server etc, then you might have noticed Netezza left and right functions are not available. There are other alternatives string functions to Netezza left and right functions, such as you can use the built in SUBSTR function or STRLEFT and STRRIGHT functions that are provided in Netezza SQL Extension tool kit. You have to download and install this SQL extension toolkit explicitly on required database. Netezza strleft Function The strleft() function returns the leftmost n characters…

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November 19, 2016

Netezza

Netezza Case Statement and its Usage with Examples

The Netezza CASE statement chooses value from a sequence of conditions, and executes a corresponding statement. The CASE statement evaluates a single expression and compares it against several potential available values, or evaluates multiple Boolean expressions and chooses the first one that is TRUE. Netezza Case Statement Syntax Searched form: CASE WHEN <search-condition-1> THEN <result-1> WHEN <search-condition-2> THEN <result-2> ... WHEN <search-condition-n> THEN <result-n> ELSE <default-result> END Search conditions can be arbitrarily complex and results can be expressions. Value form: CASE <test-value> WHEN <comparand-value-1> THEN <result-1> WHEN <comparand-value-2> THEN <result-2>…

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November 17, 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

Netezza

Netezza Create View Syntax and Examples

You can use Netezza create view to create a virtual table based on the result-set of a complex SQL statement that may have multiple table joins. Just like views in other database a Netezza view contains rows and columns, just like a real table. The fields in a view are fields from one or more real tables in the database. Netezza Views are read-only. The system does not allow you an insert, update, or delete on a view. Read: Netezza Materialized Views and Examples IBM Netezza Create Tables Netezza Alter…

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November 10, 2016

Netezza

Netezza Alter Table Command and Examples

You can use the Netezza ALTER TABLE command to change the structure of an existing table. You can add, modify existing columns in Netezza tables. If the table is in use by an active query, the ALTER command waits until that query completes. Read: Netezza CREATE TABLE command and Examples Netezza Data Types Clustered base table in Netezza Netezza Foreign Key Constraint and Syntax Netezza Primary Key Constraint and Syntax Uses of Netezza Alter Table Command The main use of the alter table command is to alter the table structure.…

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November 8, 2016

Netezza

Netezza Create Table Command and Examples

Use the Netezza CREATE TABLE command to create a new, initially empty table in the current database. The CREATE TABLE command automatically creates a data type that represents the tuple type (structure type) corresponding to one row of the table. Netezza Create Table Command Syntax CREATE [ TEMPORARY | TEMP ] TABLE <table> ( <col> <type> [<col_constraint>][,<col> <type> [<col_constraint>]…] [<table_constraint>[,<table_constraint>… ] ) [ DISTRIBUTE ON { RANDOM | [HASH] (<col>[,<col>…]) } ] [ ORGANIZE ON { (<col>) | NONE } ] [ ROW SECURITY ] Read: Importance of right Distribution…

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November 8, 2016

Netezza

nzhealthcheck Command to identify Netezza Health Check

You can perform the Netezza health check by running nzhealthcheck command. The Netezza health check is a report on how well the system is performing. Read: Netezza Architecture nzhealthcheck Command to identify Netezza Health Check To perform Netezza health check you have to login as an nz user and run command: nzhealthcheck You don’t have to pass any parameter to the above command. The output of the command presents general system information in the section MINI SYSINFO and information about the issues found in the section Failures. You can easily identify the information…

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November 7, 2016

General

Search for String Pattern in Netezza Database: Google Like Search

Have you ever wondered how to search for string pattern in Netezza database? Here is one of the method that I used in our organisation to search for string pattern in Netezza database. This is process will take bit time to search full Netezza database. Here we have used the current_catalog to search for string pattern in current database. You can pass the database name and string pattern as a form parameter if you have any front end. You can build the query and get the desired results. Read: Netezza…

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November 5, 2016