SQLite search query not working with double datatype data?

I have 3 columns. 1-latitude 2-longitude 3-place name. If I pass place name in search query I can get latlang values. But if I passed latitude or longitude value, I didn't get place name. The cursor always returns count 0. Select * from tablename where placename='chennai'---working well Select * from tablename where latitude='12.2383'--- not working Help me