¶ … Database Developer (based on job I worked on).
Syntax and Semantic Analysis
-- The Syntax errors involved misuse of keywords.
The Semantic errors involved misuse of columns and tables - there were incompatible data types.
To elaborate, the syntax refers to the structure of the program and syntactic analysis checks for errors in aspects like spelling or whether ibraces are missing in which case the program would fail syntactically.
Semantic errors, on the other hand refer to the essential meaning of the content -- whether it all makes sense and whether it is accurate (for instance writing "the sun rises in the west") is a semantic error for this is incorrect. I would have to ascertain that all data placed in tables and columns was accurate in both context and form.
b. Query Transformation
I transformed the query into simplified and standardized format based on relational algebra. Some query transformations need to be costed in order to be chosen and some not. For instance, if a table is eliminated totally from the join, then need to cost that consequent...
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