Add SQL Parser

AutomationScripts/SQL Parser/README.md

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+## SQL Parser
+
+## Short description of package/script: 
+Extracts column names and tables used by the query. Automatically conduct column alias resolution, sub queries aliases resolution as well as tables aliases resolving.
+
+Provides also a helper for normalization of SQL queries.
+
+## List out the libraries imported: 
+```` 
+pip install sql-metadata
+```` 
+
+## Example extracting raw sql
+## Input
+
+```sql
+select id, name, sum(amount) as total_amt from schema.foo a
+left join ( select id, name from schema.bar limit 10 ) b on a.id = b.id
+-- left join schema_b.bars c on b.id = c.id
+left join schema_b.foos c on b.id = c.id
+group by id, name
+limit 1000
+```
+
+## Output
+
+### sql_parser.columns
+````
+['id', 'name', 'amount', 'schema.foo.id', 'schema_b.foos.id']
+````
+
+### sql_parser.tables
+````
+['schema.foo', 'schema.bar', 'schema_b.foos']
+````
+
+### sql_parser.columns_aliases
+````
+{'total_amt': 'amount'}
+````
+
+### sql_parser.subqueries
+````
+{'b': 'select id, name from schema.bar limit 10'}
+````

AutomationScripts/SQL Parser/requirements.txt

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+import sql-metadata

AutomationScripts/SQL Parser/sql_parser.py

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+from sql_metadata import Parser
+
+rawsql = """
+        select id, name, sum(amount) as total_amt from schema.foo a
+        left join ( select id, name from schema.bar limit 10 ) b on a.id = b.id
+        -- left join schema_b.bars c on b.id = c.id
+        left join schema_b.foos c on b.id = c.id
+        group by id, name
+        limit 1000
+        """
+
+# initial Parser
+sql_parser = Parser(rawsql)
+
+# example sql_parser
+sql_parser_columns = sql_parser.columns
+print("## exact columns form sql")
+print(sql_parser_columns)
+
+sql_parser_tables = sql_parser.tables
+print("## exact schema and table form sql")
+print(sql_parser_tables)
+
+sql_parser_columns_aliases = sql_parser.columns_aliases
+print("## exact columns_aliases form sql")
+print(sql_parser_columns_aliases)
+
+sql_parser_subqueries = sql_parser.subqueries
+print("## exact subqueries form sql")
+print(sql_parser_subqueries)
+
+