Azure Synapse

SQL GROUPING SETS Alternative in Synapse

The GROUPING SETS option in SQL gives you the ability to combine multiple GROUP BY clauses into one GROUP BY clause. By definition, a grouping set is a group of columns by which you group. Azure Synapse SQL data warehouse does not support GROUPING SETS. In this article, we will check this SQL GROUPING SETS alternative in Azure Synapse SQL data warehouse with an example. SQL GROUPING SETS Alternative in Synapse As mentioned, GROUPING SETS will combine multiple GROUP BY clauses into one GROUP BY clause. The results are the…

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January 28, 2021
General

Commonly used Teradata BTEQ commands and Examples

The BTEQ stands for Basic Teradata Query is one of the commonly used tools to interact with Teradata server. BTEQ tool was the original way that SQL was submitted to Teradata as a means of getting an answer in a desired format. In this article, we will check commonly used Teradata BTEQ commands with some examples. Commonly used Teradata BTEQ commands Following BTEQ commands are commonly used when writing scripts. BTEQ CommandDescription=Repeats the previous Teradata SQL request a specified number of times.AUTOKEYRETRIEVEThis control enables users to specify whether the database…

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December 24, 2020
Redshift

How to Create an Index in Amazon Redshift Table?

Indexing is a way to optimize the databases. It will reduce the disk I/O when you execute a query to search particular value. Basically, indexing is a data structure technique which you can use to quickly locate and access the data in a database. Many traditional relational databases such as Oracle, SQL Server, etc support indexes. But, being a columnar database, Amazon Redshift does not support indexing on the tables. In this article, we will check alternate approach to create an index in the Amazon Redshift table. How to Create…

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November 25, 2020
Snowflake

Snowflake Unsupported subquery Issue and How to resolve it

Snowflake provides rich support of subqueries. But, some scalar subqueries that are available in the relational databases such as Oracle are not supported in Snowflake yet. We have to identify the alternate methods for such a subqueries. In this article, we will check Snowflake unsupported subquery issue and how to resolve it? Snowflake Unsupported subquery Issue SQL compilation error: Unsupported subquery type cannot be evaluated You are here because you might have got above error message during SQL migration from databases such as Oracle. For example, consider following Oracle query…

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November 10, 2020
GCP BigQuery

What is SQL Cursor Alternative in BigQuery?

SQL Cursor is a database object to retrieve data from a result set one row at a time. The cursor are useful in many scenarios such as updating records using loops, inserting only required records, etc. You can think cursor as a temporary workspace provisioned in database system memory when a SQL query is executed. SQL Cursor always returns one row at a time, you can perform your calculation on returned values. In this article, we will check what is SQL cursor alternative in Google BigQuery with an example. Cursors…

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October 28, 2020
General

Teradata Extract Function Syntax and Example

The extract function in Teradata extracts date or time part of the date, time, timestamp, or interval fields. The extract function retrieves the sub part such as day, month, year, etc. This extract function is equivalent to date_part() function in other relational databases. In this article, we will check how to use an extract function to get specified subpart. The extract function also converts the extracted value exact numeric format. The output is always a numeric value. Teradata Extract Function In a data warehouse, you will be working with many…

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October 22, 2020
GCP BigQuery

Google BigQuery Recursive CTE: Native Query and Alternative Example

If you need to query hierarchical data like an organizational chart, employee-manager relationships, or a bill of materials a recursive query is the standard approach. While developers previously had to rely on scripting workarounds, Google BigQuery now fully supports native recursive CTEs. In this guide, we will look at how to write a native BigQuery recursive query, as well as a legacy alternative using a WHILE loop. Page Content Introduction Native BigQuery Recursive CTE (WITH RECURSIVE) BigQuery Recursive Query Alternative Using WHILE Loop Conclusion Introduction Identifying hierarchies of data used…

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October 16, 2020
GCP BigQuery

BigQuery Control Flow Statements – IF, LOOP, WHILE

Similar to relational databases such as SQL Server, BigQuery supports scripting. BigQuery scripting allows you to send multiple statements to BigQuery in one request. You can also set variables, and use it in any supported control flow statements such as IF and WHILE. For example, you can declare a variable, assign a value to it, and then reference it in a loop statement. In this article, we will check what are BigQuery Control Flow Statements with some examples. In BigQuery, a script is a SQL statement list to be executed in sequence. A…

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October 15, 2020
Azure Synapse

Azure Synapse Recursive Query Alternative-Example

You can use recursive query to query hierarchies of data, such as an organizational structure, bill-of-materials, and document hierarchy. Though Azure Synapse uses T-SQL, but it does not support all features that are supported in T-SQL. One of such features is Recursive CTE or VIEWS. Azure Synapse does not support either WITH RECURSIVE Clause or using the RECURSIVE Clause in a CREATE VIEW Statement. In this article, we will check Azure Synapse Recursive Query Alternative with an working example. Azure Synapse Recursive Query Alternative In the other RDBMS such as…

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October 13, 2020
BigData

Hive Pivot Table-Transpose Rows to Column and Example

Many relational databases such as Oracle, Snowflake support PIVOT function which you can use to convert row to column. But, Apache Hive does not support Pivot function yet. As an alternative method, you can use CASE and DECODE statements to convert table rows to column, or columns to rows as per your requirements. In this article, we will check different methods to transpose Hive table using a Pivot function alternative method with some examples. Hive Pivot Table Creating pivot table is a relatively common task in a data warehouse. You…

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September 25, 2020