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View Code? Open in Web Editor NEWA Relational Algebra based SQL like Parser in Python
A Relational Algebra based SQL like Parser in Python
Open The Parser Python File in Linux or Windows Idle and run as python parser.py in Linux. =======> This is the Help Manual for the Relational Algebra <======== Here are the instructions ================================================================================================================================================== 1.Selection (Sigma): This is used to simulate the select or the sigma operator of relational algebra to select few tuples. Syntax : " select/sigma | <relation_name> | on | <conditions> " This can also be used recursively,where , you need to write the name of expression instead of the <relation_name> field -------------------------------------------------------------------------------------------------------------------------------------------------- 2.Project (Pi): Return a new relation with a heading restricted to the given fields or like the pi operator of relational algebra to project few columns. Syntax : " project/pi | <list_of_attributes> | from | <relation_name> " This can also be used recursively,where , you need to write the name of expression instead of the <relation_name> field -------------------------------------------------------------------------------------------------------------------------------------------------- 3.Rename (Rho): This is used to rename some fields in this relation, like the rho operator in relational algebra. Syntax : " rename/rho | <old_relation_name> | to | <new_relation_name> | <new_attributes> " --------------------------------------------------------------------------------------------------------------------------------------------------
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