What is the difference between study and survey?

Answer 1

A study is carried out to get more knowledge about a subject; sources for a study can range from reviews of previous studies or information, to primary research.

A survey is one tool available to undertake a study. A survey may cover opinions (an opinion poll), behaviors, or observable or measurable data. The major feature of a survey is that it should take this data from a sample of a given population*, in order to make assumptions about that population (given that you will never have the resources or time to gather data on every member of a population). There are various ways to choose this sample to ensure that it is random (not biased towards certain groups), and that it is representative of the rest of the population of interest.

*Note: The "population" may be the population of a country or other area, but may also be defined in other ways- for instance all people who use a certain health service, or all people over the age of 30 who have ever had breast cancer...).

Answer 2

A study is observing a person or thing as a whole over a given period of time and then interpreting its results, while survey is observing the details of everything related to that person or thing for short time to inter-prate the results.