Lab Sql

I have a requirement to have 612 columns in my database table. The # of columns as per data type ar… Read more Db Design And Data Retrieval From A Heavy Table

How do I adapt the query below so that it doesn't perform unnecessary UNION ALL unless the SELE… Read more Abort Subsequent Union All Commands If Match Found [h2]

I have this query to get all detail of Bills between two dates: SELECT DT.* FROM DetailTable DT, B… Read more Timeout Expired, Optimize Query

I have a bunch of candidates, who have had one or more jobs, each with a company, using some skills… Read more Why Is My Query Returning Far To Many Results?

I have a SQL that can be simplified to: SELECT * FROM table WHERE LOCATE( column, :keyword ) &… Read more How To Eliminate Duplicate Calculation In Sql?

I have read the theory and views behind SQL Server 2008's 'OPTIMIZE FOR UNKNOWN' query … Read more Experience With When To Use Optimize For Unknown

I have this Informix SQL statement which takes ages to run. Does anybody see any way to optimize i… Read more Sql Statement Performance Issue On Informix

I need some help writing/optimizing a query to retrieve the latest version of each row by type and … Read more How To Obtain The Most Recent Row Per Type And Perform Calculations, Depending On The Row Type?