diff --git a/.gitignore b/.gitignore
index 36eb050..48d6ec7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@ vendor/
 .DS_Store
 .eggs
 .vscode
+out.k
\ No newline at end of file
diff --git a/README.md b/README.md
index 3dd55ed..acf25f4 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,10 @@ Frontend built on top of [mo-sql-parsing](https://github.com/klahnakoski/mo-sql-
 
 ## Roadmap
 - [x] SQL Parser -> AQuery Parser
+  - [ ] Data acquisition/output from/to csv file (By Jan. 21)
 -  -> AQuery-K9 Compiler
+   -   Simple query (By Jan. 21)
+   -  [ ] Nested queries (Jan. 28)
 - [ ] -> Optimizing Compiler
 
 # Descriptions from mo-sql-parsing:
diff --git a/engine/__init__.py b/engine/__init__.py
index f89c760..c335042 100644
--- a/engine/__init__.py
+++ b/engine/__init__.py
@@ -1,5 +1,5 @@
 from engine.ast import Context, ast_node
-import engine.ddl
+import engine.ddl, engine.projection
 
 def initialize():
     return Context()    
@@ -8,6 +8,5 @@ def generate(ast, cxt):
     for k in ast.keys():
         if k in ast_node.types.keys():
             root = ast_node.types[k](None, ast, cxt)
-
-
-__all__ = ["generate"]
+            
+__all__ = ["initialize", "generate"]
diff --git a/engine/ast.py b/engine/ast.py
index f43af0a..40d6782 100644
--- a/engine/ast.py
+++ b/engine/ast.py
@@ -1,36 +1,53 @@
 from typing import List
+import uuid
 
 
 class TableInfo:
     def __init__(self, table_name, cols, cxt:'Context'):
         # statics
         self.table_name = table_name
-        self.columns = dict() # column_name, type
+        self.columns_byname = dict() # column_name, type
+        self.columns = []
+
         for c in cols:
-            self.columns[c['name']] = ((list(c['type'].keys()))[0], c)
             k9name = self.table_name + c['name']
             if k9name in cxt.k9cols_byname: # duplicate names?
                 root = cxt.k9cols_byname[k9name] 
-                k9name = k9name + root[1]
-                root[1] += 1
-            cxt.k9cols[c] = k9name
-            cxt.k9cols_byname[k9name] = (c, 1)
+                k9name = k9name + root[3]
+                root[3] += 1
+
+            # column: (k9name, type, original col_object, dup_count)
+            col_object =  (k9name, (list(c['type'].keys()))[0], c, 1)
+
+            cxt.k9cols_byname[k9name] = col_object
+            self.columns_byname[c['name']] = col_object
+            self.columns.append(col_object)
+
         # runtime
-        self.n_cols = 0 # number of cols
+        self.n_rows = 0 # number of cols
         self.order = [] # assumptions
 
         cxt.tables_byname[self.table_name] = self # construct reverse map
 
-    def get_k9colname(self, cxt:'Context', col_name):
-        return cxt.k9cols[self.columns[col_name][1]] # well, this is gnarly.. will change later
+    @property
+    def n_cols(self):
+        return len(self.columns)
+
+    def get_k9colname(self, col_name):
+        return self.columns_byname[col_name][0]
+
+    def parse_tablenames(self, str):
+        # TODO: deal with alias
+        return self.get_k9colname(str)
 
 class Context:
     def __init__(self): 
         self.tables:List[TableInfo] = []
         self.tables_byname = dict()
-        self.k9cols = dict()
         self.k9cols_byname = dict()
 
+        self.udf_map = dict()
+
         self.k9code = ''
 
     def add_table(self, table_name, cols):
@@ -38,9 +55,14 @@ class Context:
         self.tables.append(tbl)
         return tbl
 
+    def gen_tmptable(self):
+        from engine.utils import base62uuid
+        return f'tmp{base62uuid()}'
+
     def emit(self, codelet):
         self.k9code += codelet + '\n'
-
+    def emit_nonewline(self, codelet):
+        self.k9code += codelet
     def __str__(self):
         return self.k9code
 
@@ -48,18 +70,35 @@ class ast_node:
     types = dict()
     def __init__(self, parent:"ast_node", node, context:Context = None):
         self.context = parent.context if context is None else context
+        self.init(node)
         self.produce(node)
-        self.enumerate(node)
+        self.spawn(node)
         self.consume(node)
     
     def emit(self, code):
         self.context.emit(code)
+    def emit_no_ln(self, code):
+        self.context.emit_nonewline(code)
 
     name = 'null'
 
+    # each ast node has 3 stages. 
+    # `produce' generates info for child nodes
+    # `spawn' populates child nodes
+    # `consume' consumes info from child nodes and finalizes codegen
+    # For simple operators, there may not be need for some of these stages
+    def init(self, _):
+        pass
     def produce(self, _):
         pass
-    def enumerate(self, _):
+    def spawn(self, _):
         pass
     def consume(self, _):
         pass
+
+# include classes in module as first order operators
+def include(objs):
+    import inspect
+    for _, cls in inspect.getmembers(objs):
+        if inspect.isclass(cls) and issubclass(cls, ast_node):
+            ast_node.types[cls.name] = cls
\ No newline at end of file
diff --git a/engine/ddl.py b/engine/ddl.py
index 32a8113..2fd8110 100644
--- a/engine/ddl.py
+++ b/engine/ddl.py
@@ -1,4 +1,7 @@
-from engine.ast import TableInfo, ast_node
+# code-gen for data decl languages
+
+from engine.ast import TableInfo, ast_node, include
+
 class create_table(ast_node):
     name = 'create_table'
     def produce(self, node):
@@ -6,17 +9,24 @@ class create_table(ast_node):
         tbl = self.context.add_table(ct['name'], ct['columns'])
         # create tables in k9
         for c in ct['columns']:
-            self.emit(f"{tbl.get_k9colname((list(c['name'].keys())))[0]}:()")
+            self.emit(f"{tbl.get_k9colname(c['name'])}:()")
 
-class insert_into(ast_node):
+class insert(ast_node):
     name = 'insert'
     def produce(self, node):
         ct = node[self.name]
         table:TableInfo = self.context.tables_byname[ct]
-        
 
-import sys, inspect
-
-for name, cls in inspect.getmembers(sys.modules[__name__]):
-    if inspect.isclass(cls) and issubclass(cls, ast_node):
-        ast_node.types[name] = cls
\ No newline at end of file
+        values = node['query']['select']
+        if len(values) != table.n_cols:
+            raise ValueError("Column Mismatch")
+        for i, s in enumerate(values):
+            if 'value' in s:
+                k9name = table.columns[i][0]
+                self.emit(f"{k9name}:{k9name},{s['value']}")
+            else:
+                # subquery, dispatch to select astnode
+                pass
+        
+import sys
+include(sys.modules[__name__])
\ No newline at end of file
diff --git a/engine/expr.py b/engine/expr.py
new file mode 100644
index 0000000..3722a3b
--- /dev/null
+++ b/engine/expr.py
@@ -0,0 +1,46 @@
+from engine.ast import ast_node
+
+
+class expr(ast_node):
+    name='expr'
+    builtin_func_maps = {
+            'max': 'max',
+            'min': 'min', 
+
+        }
+    binary_ops = {'sub':'-', 'plus':'+'}
+    unary_ops = []
+    def __init__(self, parent, node):
+        from engine.projection import projection
+        if type(parent) in [projection, expr]:
+            self.datasource = parent.datasource
+        else:
+            self.datasource = None
+        self.udf_map = parent.context.udf_map
+        self.k9expr = ''
+        self.func_maps = {**self.udf_map, **self.builtin_func_maps}
+        ast_node.__init__(self, parent, node, None)
+
+    def produce(self, node):
+        if type(node) is dict:
+            for key, val in node.items():
+                if key in self.func_maps:
+                    self.k9expr += f"{self.func_maps[key]}(" 
+                    # if type(val) in [dict, str]:
+                    self.k9expr += expr(self, val).k9expr
+
+                    self.k9expr+=')'
+                elif key in self.binary_ops:
+                    l = expr(self, val[0]).k9expr
+                    r = expr(self, val[1]).k9expr
+                    self.k9expr += f'({l}{self.binary_ops[key]}{r})'
+                    
+                    print(f'binary{key}')
+                elif key in self.unary_ops:
+                    print(f'unary{key}')
+                else:
+                    print(key)
+        elif type(node) is str:
+            self.k9expr = self.datasource.parse_tablenames(node)
+    def __str__(self):
+        return self.k9expr
\ No newline at end of file
diff --git a/engine/join.py b/engine/join.py
new file mode 100644
index 0000000..9aa462f
--- /dev/null
+++ b/engine/join.py
@@ -0,0 +1,6 @@
+from engine.ast import ast_node
+
+
+class join(ast_node):
+    name='join'
+    
\ No newline at end of file
diff --git a/engine/projection.py b/engine/projection.py
new file mode 100644
index 0000000..3e444b7
--- /dev/null
+++ b/engine/projection.py
@@ -0,0 +1,72 @@
+from engine.ast import TableInfo, ast_node, Context, include
+from engine.join import join
+from engine.expr import expr
+from engine.utils import base62uuid
+
+class projection(ast_node):
+    name='select'
+    def __init__(self, parent:ast_node, node, context:Context = None, outname = None, disp = True):
+        self.disp = disp
+        self.outname = outname
+        ast_node.__init__(self, parent, node, context)
+    def init(self, _):
+        if self.outname is None:
+            self.outname = self.context.gen_tmptable()
+
+    def produce(self, node):
+        p = node['select']
+        self.projections = p if type(projection) == list else [p]
+        print(node)
+
+    def spawn(self, node):
+        self.datasource = None
+        if 'from' in node:
+            from_clause = node['from']
+            if type(from_clause) is list:
+                # from joins
+                join(self, from_clause)
+            elif type(from_clause) is dict:
+                if 'value' in from_clause:
+                    value = from_clause['value']
+                    if type(value) is dict:
+                        if 'select' in value:
+                            # from subquery
+                            projection(self, from_clause, disp = False)
+                        else:
+                            # TODO: from func over table
+                            print(f"from func over table{node}")
+                    elif type(value) is str:
+                        self.datasource = self.context.tables_byname[value]
+                if 'assumptions' in from_clause:
+                    ord = from_clause['assumptions']['ord'] == 'asc'
+                    ord = '^' if ord else '|^'
+                    # TODO: generate view of table by order
+
+            elif type(from_clause) is str:
+                self.datasource = self.context.tables_byname[from_clause]
+            
+            if self.datasource is None:
+                raise ValueError('spawn error: from clause')
+    
+
+
+    def consume(self, node):
+        disp_varname = 'disptmp' + base62uuid()
+        self.emit_no_ln(f'{disp_varname}:(')
+        for proj in self.projections:
+            if type(proj) is dict:
+                if 'value' in proj:
+                    e = proj['value']
+                    
+                    if type(e) is str:
+                        self.emit_no_ln(f"{self.datasource.parse_tablenames(proj['value'])};")
+                    elif type(e) is dict:
+                        self.emit_no_ln(f"{expr(self, e).k9expr};")
+
+        self.emit(')')
+        if self.disp:
+            self.emit(disp_varname)
+
+
+import sys
+include(sys.modules[__name__])
\ No newline at end of file
diff --git a/engine/utils.py b/engine/utils.py
new file mode 100644
index 0000000..60f3389
--- /dev/null
+++ b/engine/utils.py
@@ -0,0 +1,12 @@
+import uuid
+
+def base62uuid(crop=8):
+    alp = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
+    id = uuid.uuid4().int
+    ret = ''
+
+    while id:
+        ret = alp[id % 62] + ret
+        id //= 62
+    
+    return ret[:crop] if len(ret) else '0'
\ No newline at end of file
diff --git a/run.py b/run.py
index cff956d..afec3cc 100644
--- a/run.py
+++ b/run.py
@@ -16,8 +16,14 @@ print(res)
 while test_parser:
     try:
         q = input()
-        if q == 'break':
-            break
+        if q == 'exec':
+            cxt = engine.initialize()
+            for s in stmts['stmts']:
+                engine.generate(s, cxt)
+            print(cxt.k9code)
+            with open('out.k', 'wb') as outfile:
+                outfile.write(cxt.k9code)
+            continue
         trimed = ws.sub(' ', q.lower()).split(' ') 
         if trimed[0] == 'file':
             fn = 'q.sql' if len(trimed) <= 1 or len(trimed[1]) == 0 \
@@ -32,6 +38,3 @@ while test_parser:
     except Exception as e:
         print(type(e), e)
 
-cxt = engine.initialize()
-for s in stmts['stmts']:
-    engine.generate(s, cxt)
diff --git a/stock.a b/stock.a
index d847d8c..992b952 100644
--- a/stock.a
+++ b/stock.a
@@ -17,6 +17,9 @@ INSERT INTO stocks VALUES(14,5)
 INSERT INTO stocks VALUES(15,2)
 INSERT INTO stocks VALUES(16,5)
 
-SELECT max(price-mins(price))
+SELECT max(price-min(timestamp)) FROM stocks 
+
+
+/*SELECT max(price-mins(price))
 FROM stocks
-     ASSUMING ASC timestamp
+     ASSUMING ASC timestamp*/