Software development life cycle (SDLC) can be defined as a strategic process or methodology that defines the key steps or stages for creating and implementing high quality software applications.
Some of the models used in the software development life cycle (SDLC) are;
I. Waterfall model.
II. Incremental model.
III. Spiral model.
IV. Agile model.
V. Big bang model.
VI. V-shaped model.
A database schema is a structure which is typically used to represent the logical design of the database and as such represents how data are stored or organized and the relationships existing in a database management system. There are two (2) main categories of a database schema; physical database schema and logical database schema.
Last_modified can be defined as a data type which comprises of the date and time that a resource such as a software application or file was edited or changed.
Hence, Last_modified is a reasonable data type that could be included in nearly any item in a logical data model for a software application.
Say you got a dress from Macys but you dont like or it doesnt fit whitin 30 days usally you can take it back(with receipt . Most of the time you must show whoever you want the refund from a receipt.
There are way in separating mixtures of chlorides salts such as that of sodium chloride and ammonium chloride. It can be done by crystallization, filtration or sublimation. If we want to separate the mixture, we have to heat up to 330-350 degrees Celsius and collect the gas that will be produced.
