I have a table in a MySQL database. I am given a value that occurs as a cell value in that table but I do not know which cell is it i.e. the row and column of that cell. What is
Without knowing more about your app, you have several options:
Use MySQL's built-in full-text search. You can check the MATCH function in the MySQL documentation.
Depending on the needs of your app you could decide to index your whole table with an external full-text search index, like Solr or Sphynx. This provides instant response time, but you'll need to keep the index updated.
You can loop through all the columns in the table doing a LIKE query in MySQL (very expensive in CPU and time)