Question: How many SQL client licenses are required in an application with two E3Servers (in Hot-Standby) and five Viewers? Solution: The communication between E3 and the database happens exclusively in…
Question: My application’s got slower after two weeks working with an Access database. Why has this happened, and how can I fix it? Solution: This may have happened because the…
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:…
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…
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…
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…
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…
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…
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,…
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…