Posts

Group by Date when Stored in Mysql DataBase as Date Time

I have a table called date_count with 2 columns one is a value and another is a date time, say called date_time in mysql. Date Time in mysql is stored as dd-mm-yy hh:mm:ss. The issue comes when I need to get the number of rows per day. As its stored as dat …

Customizing Mysql Prompt For multiple Servers

If you are using mysql regularly on multiple servers its really useful to have the promt in mysql to show something more than mysql>. It would be useful if it showed the username,hostname, current database and things like that. So how to do this. One m …

Enable Multiple Login in Same Account in Gmail

Gmail recently started merging its App accounts to Gmail. Hence you wont be able to login into both the accounts in the same browser now. Here is a way on which you can still do it. This can be done for people who have multiple gmail accounts and want to b …

Ontology Linked Data

The following is a Assignment on Ontology and Linked Data and the evolution of data which lead to the use of ontology in web. Thanks to my teammates Bharath Gowda and Sravani Thota for working on the same. Ontology And Linked Data An ontology formally r …

Simplest way to remove trailing zeros of decimal numbers

This is a simple method I found to remove or strip trailing zeros of a decimal number. The function accepts the decimal number and return the trimmed value back. It removes all the redundant zeros in the number after the decimal point and if no number othe …

Get the nth Word from a text field in mysql

I had a requirement to get the nth word out of a string and sort or order by the same. This is used when the text is stored in a purticular format and you would want to order it according to that or group it or so on. So how is it done? We do it using a  …

Service Engineer/System Administrator Interview Questions

This is not my code alone.  It was the group effort of Vivek Ram, Cijo George, Sandeep Unni and mine during our epic preparation for Yahoo!. I am just putting it open for others who would be looking for this information. Convert all lower case to upper  …

Important MySQL DBA Interview Questions

Here are a few sets of interview questions expected for MySQL DBA position.These are compilation of the usual questions from various DBA texts: What is Log Switch? – The point at which ORACLE ends writing to one online redo log file and begins writing to …

Create a table like another table or from a select query

There are some cases where we need to create a table similar or exactly same as another table. The easiest and best way is use create table along with additional parameters. We can create a table similar to another table without data and with data. Creat …

More than 100% CPU in top in Linux/Mac

If you are power linux/mac user you should have noticed at least once that top shows more than 100% CPU for a process. I also have seen this multiple times but always wondered how it can be. Here is an example of how my top looked when I started my java an …