Relational-Algebra-Query-Processor

Caution: this program uses eval function causing a significant vulnerability when used by a malicious actor.

Syntax

Relation creation:

Table_Name (h1, h2, ..., hn) {

row1-1, row1-2, ..., row1-n

...

};

Queries

• Unary operators: keyword "condition" (relation);
• binary operators: keyword "condition" (relation1)(relation2);

Notes

• Semi-colon necessary at end of each command
• Space after keyword necessary
• Unary operators keywords: [select, project]
• Binary operators keywords: [ijoin, ljoin, rjoin, ojoin, union, minus, intersect]
• Condition must be in quotes
• queries can be linked together
• if two tables are linked that has the same column header, the second header will have the "<relation2_name>." prefixed to it