The scope of SQL includes data insert, query, update and delete, schema creation and modification, and data access control. Although SQL is often described as, and to a great extent is, a declarative language, it also includes procedural elements. SQL was one of the first commercial languages for Edgar F. Codd's relational model, as described in his influential 1970 paper A Relational Model of Data for Large Shared Data Banks.
The presence of bile is indicated by a watery, yellow-green substance in the vomit contents. If vomiting does not occur and the bile remains in the stomach, the irritation to the stomach can lead to gastric reflux.
When the amount of bile salts is significantly reduced or they are absent, the stool can be pale yellow or grey. Liver disease can interfere with bile salt production, and anything that blocks the bile ducts can prevent bile salts from reaching the intestines. Fats can also cause the stool to be yellow. Excess fat in the stool can be due to decreased fat digestion, which can occur with conditions involving the pancreas or decreased absorption in the intestines, which can occur with some intestinal conditions.