Does order matter in Union SQL? The union statement puts the two selects together by order, not by name. The order has to be the same in all of the queries you’re unioning together. Beyond that, the general order of the columns in the query as a whole doesn’t matter. How do I set priority […]
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Why does JMeter return no database selected error?
Why does JMeter return no database selected error? Without specifying the scheme, JMeter returns the error: “Response message: java.sql.SQLException: No database selected”. JDBC driver class: The class in which the code of work with a particular database is implemented (This class was created by the developers of JDBC driver). How to configure MySQL connection to […]
Which browsers support a WebSocket?
Which browsers support a WebSocket? Browser support for WebSocket Browser WebSocket Support Mozilla Firefox 6, 7, and 8 Supported Google Chrome 15.x and above Supported Safari 5.x Supported (Android) Default browser Supported What type of data is used for WebSocket? Data transfer WebSocket communication consists of “frames” – data fragments, that can be sent from […]
How to check if a user already exists?
How to check if a user already exists? If a user with the provided username already exists in the database, a validation message with appropriate styling is displayed right away. For the remaining part of this tutorial, let’s do it in steps; How to find out if a record already exists in a database? Typically […]