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Useful Oracle SQL queries and scripts	Don't you have a chop with useful queries to use in your daily adventures and desventures with the database? I include in this first post a…
How to do an update from a select with summarized registers in SQLServer	A very powerful way to do a table's update in a SQL Server database is to link it with another table with a join, and updating the fields…
Easily export data from Oracle to flat file	A simple way to export data from a query, table, etc.. of an oracle database to a flat file is to use the SPOOL command in SQLPlus. This…
Avoiding errors concatenating fields with numerical values in SQL Server	The operator to concatenate in SQL Server is '+', but this operator is also used to add values. Being the same operator for both, the…
Tips for UPSERT or update using insert in SQL Server	In many cases, especially in ETL processes or data loading to a data warehouse, for example, we would rather use a single sentence or the…
How to recover the password of the user sa on SQL Server	With SQL Server, when we forget or we lose the password of the DBA user 'sa', and we are the administrators of the database, we have a…
How to connect from Oracle SQL Developer with a remote SQL Server	I tried to create a connection in SQL Developer with a remote SQL Server database.
Data Warehouse Security Best Practices	Data warehouse security is vital for organizations that take the huge step of collating all their important data in one place. Unauthorized…
Improve MySQL performance by adjusting some parameters	MySQL, like most database managers, can easily modify the parameters that control memory sizes engaged in certain tasks, resource…
How to disable autocommit option in SQL Server Management Studio	Have you ever wondered how to disable the autocommit option in Sql Server Management Studio? The answer is quick. Simply uncheck the option…
db2look – Create DDL for table or full schema	Db2look is an utility to extract the definition of database objects.
How to connect to a remote MySQL database	MySQL has some special features when making a connection from a remote client that if we do not know can complicate access to a MySQL…
The Time Dimension Structure and Loading script for SQLServer	In a Data Warehouse there are a number of common dimensions such as Geographic and Time. I leave here a script to create the Time…
Slowly Changing Dimensions	Slowly changing dimensions or SCD (Slowly Changing Dimensions) are dimensions in which their data tend to change over time, either…
TOP 10 rows on DB2	In this shosrt post we will show how to obtain the N first rows from a Query on IBM DB2.
Detecting indexes, tables and packages not used on DB2	DB2, from version 9.7, allows to know easily what indexes are not being used in a Database.
Pentaho BI Suite	Pentaho was created in 2004 and at this moment, it is the leader of the Open Source BI solutions. It offers a large spectrum of resources…
Popular Agile Testing Metrics and KPIs and How to Use Them	Agile test metrics and KPIs are measurements that enable Agile teams to assess how effective their software tests are and whether their…
How to access from SQL Server to MySQL databases	We could need to access to MySQL from SQL Server. An easy way to do it is creating a linked server that uses an ODBC connection..
Four questions to identify a developer with no knowledge of database	I leave here this link to a page where a small test posed to do in job interviews for database developers. Here this kind of test I do not…

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