A Mini SQL Engine which runs a subset of queries using Command Line Interface. All tables are required to be in .csv format stored in a directory named files. There must be a file named metadata.txt in files directory which contains metadata of each table.
This Engine supports the following types of queries
- Select queries: Example -
Select * from table_name;. - Project Columns: Example -
Select col1, col2 from table_name;. - Aggregate Function: Sum, average, max & min are supported. Example -
Select max(col1) from table_name;. - Distinct: Example -
Select distinct col1, col2 from table_name;. - Where: Also supports queries with multiple tables. Example -
Select col1, col2 from table_name1, table_name2 where col1=val1 and col2=val2; - Join: Projection of one or more(including all the columns) from two tables with one join
condition. Example -
Select col1, col2 from table1,table2 where table1.col1=table2.col2;.
It also handles invalid queries and prints appropriate error statements.
pip install -r requirements.txt
python3 main.py <Query in double quotes>
There are some sample queries in run.sh. You can run them by the command ./run.sh