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hallo toots welcome to tech TOCOM so in this lecture we will understand what is weak entity if you remember while learning the notations of entity relationship diagram we left few terms like weak entity total participation and identifying the relationship and partial key so all those things we will be covering in this lecture so lets start well weak entity is a entity type which does not have a key attribute okay so lets understand it with an example first and then we will revise the definitions okay so consider this is entity type employee employ now each employee I mean the company is also taking care of the dependent of a employee of an employees okay so there will be a entity dependent dependent okay this is dependent okay this is dependent and there will be a relationship among this like employee has dependent okay now if the database is so designed that the that the dependent will not have any key okay for example we have to three things for dependent like name name than DOB a