Structure Query Language (SQL): Chapter 7 – Views.
A view is an alternative solution for observing data from one or more of the tables comprising a database. You can regard it as a virtual table or a stored…
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Structure Query Language (SQL): Chapter 8 – Triggers.
Triggers are a type of special stored procedures that are executed whenever there is an attempt to change the data in a table protected by them. DML triggers (Data Manipulation…
Connecting Elipse SCADA to an OpenOffice Calc spreadsheet.
OpenOffice can establish a DDE connection, where you can read data via Elipse SCADA. According to the software’s documentation, to do so you will need to insert the following paramenters:…
Structure Query Language (SQL): Chapter 9 – Stored Procedures.
A stored procedure is a set of instructions developed in T-SQL language (Transact-Sql) that, whenever stored or saved, are inside the server in a pre-compiled way. This procedure is stored…
Structure Query Language (SQL): Chapter 4 – Backup.
The main task in a Database manager is to not just make sure all data is inserted, but also that these data continue existing. Regardless of the contingency system, the…
Structure Query Language (SQL): Chapter 6 – SQL Commands.
This article illustrates a few SQL commands. To illustrate how they are used, the following tables will work as reference: Store_Information table: Store_Name Sales Date_Time Los Angeles 1500 05-Jan-1999…
KB-64106: Counting lines in text (TXT) files via E3.
Question: How can I count the number of lines in a TXT file? Solution: To do so, you must use the methods in FileSystemObject object. Example: ‘Script for returning lines…
KB-64100: Returning a specific line in a text file (TXT) via E3.
Question: How can I return the contents of a specific line in a TXT file? Solution: To do so, you must use the methods in FileSystemObject objects. Example: Const ForReading…
Creating a cumulative sum with an SQL database using just one Query.
To create a cumulative sum of a table field, you can set up a Query with SQL’s Inner Join command. Example: Date/Hour Field Accumulated 20/02/2014 09:54:05 1 1 20/02/2014…
KB-63563: Exporting a chart report when E3Chart is not visualized on screen.
Many times, a chart report must be exported automatically, with no intervention from the operator. Therefore, the Report’s Chart object must be set up so that data is moved correctly,…