diff --git a/src/based/__init__.py b/src/based/__init__.py
index 3dc1f76..d3ec452 100644
--- a/src/based/__init__.py
+++ b/src/based/__init__.py
@@ -1 +1 @@
-__version__ = "0.1.0"
+__version__ = "0.2.0"
diff --git a/src/based/columns.py b/src/based/columns.py
index da35c87..2d139d6 100644
--- a/src/based/columns.py
+++ b/src/based/columns.py
@@ -1,37 +1,23 @@
 from datetime import date
-from psycopg.sql import SQL, Identifier, Literal, Composed
+from psycopg.sql import SQL, Identifier, Literal
 
 
 class ColumnDefinition:
-    def __init__(self, name: str):
+    def __init__(self, name: str, unique: bool, has_default: bool = False):
         self.name = name
+        self.unique = unique
+        self.has_default = has_default
 
     def sql(self):
-        raise NotImplementedError
+        raise NotImplementedError()
 
     def serialize(self):
-        raise NotImplementedError
-
-
-class UniqueColumnDefinition(ColumnDefinition):
-    def __init__(self, wrapped: ColumnDefinition):
-        super().__init__(wrapped.name)
-        self.wrapped = wrapped
-
-    def sql(self):
-        return SQL("{} UNIQUE").format(self.wrapped.sql())
-
-    def serialize(self):
-        return f"{self.wrapped.serialize()}:unique"
-
-
-def make_column_unique(column) -> UniqueColumnDefinition:
-    return UniqueColumnDefinition(column)
+        raise NotImplementedError()
 
 
 class PrimarySerialColumnDefinition(ColumnDefinition):
     def __init__(self, name: str):
-        super().__init__(name)
+        super().__init__(name, unique=False)
 
     def sql(self):
         return SQL("{} SERIAL PRIMARY KEY").format(Identifier(self.name))
@@ -40,150 +26,106 @@ class PrimarySerialColumnDefinition(ColumnDefinition):
         return f"{self.name}:serial:primary"
 
 
-class PrimaryUUIDColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str):
-        super().__init__(name)
-
-    def sql(self):
-        return SQL("{} uuid DEFAULT gen_random_uuid() PRIMARY KEY").format(
-            Identifier(self.name)
-        )
-
-    def serialize(self):
-        return f"{self.name}:uuid:primary"
-
-
 class TextColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: str | None = None):
-        super().__init__(name)
+    def __init__(self, name: str, default: str | None = None, unique: bool = False):
+        if default is not None and unique:
+            raise ValueError("Cannot have a default value and be unique")
+        super().__init__(name, unique)
         self.default = default
 
     def sql(self):
         if self.default is None:
-            return SQL("{} TEXT").format(Identifier(self.name))
+            return SQL("{} TEXT UNIQUE" if self.unique else "{} TEXT").format(
+                Identifier(self.name)
+            )
         else:
             return SQL("{} TEXT DEFAULT {}").format(
                 Identifier(self.name), Literal(self.default)
             )
 
     def serialize(self):
-        return f"{self.name}:str"
-
-
-class BigintColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: int | None = None):
-        super().__init__(name)
-        self.default = default
-
-    def sql(self):
-        if self.default is None:
-            return SQL("{} BIGINT").format(Identifier(self.name))
-        else:
-            return SQL("{} BIGINT DEFAULT {}").format(
-                Identifier(self.name), Literal(self.default)
-            )
-
-    def serialize(self):
-        return f"{self.name}:bigint"
+        return f"{self.name}:str{':unique' if self.unique else ''}{':default' if self.default is not None else ''}"
 
 
 class BooleanColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: bool | None = None):
-        super().__init__(name)
+    def __init__(self, name: str, default: bool | None = None, unique: bool = False):
+        if default is not None and unique:
+            raise ValueError("Cannot have a default value and be unique")
+        super().__init__(name, unique)
         self.default = default
 
     def sql(self):
         if self.default is None:
-            return SQL("{} BOOLEAN").format(Identifier(self.name))
+            return SQL("{} BOOLEAN UNIQUE" if self.unique else "{} BOOLEAN").format(
+                Identifier(self.name)
+            )
         else:
             return SQL("{} BOOLEAN DEFAULT {}").format(
                 Identifier(self.name), Literal(self.default)
             )
 
     def serialize(self):
-        return f"{self.name}:bool"
-
-
-class DateColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: date | None = None):
-        super().__init__(name)
-        self.default = default
-
-    def sql(self):
-        if self.default is None:
-            return SQL("{} DATE").format(Identifier(self.name))
-        else:
-            return SQL("{} DATE DEFAULT {}").format(
-                Identifier(self.name), Literal(self.default)
-            )
-
-    def serialize(self):
-        return f"{self.name}:date"
+        return f"{self.name}:bool{':unique' if self.unique else ''}{':default' if self.default is not None else ''}"
 
 
 class TimestampColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: date | None = None):
-        super().__init__(name)
+    def __init__(self, name: str, default: date | None = None, unique: bool = False):
+        if default is not None and unique:
+            raise ValueError("Cannot have a default value and be unique")
+        super().__init__(name, unique)
         self.default = default
 
     def sql(self):
         if self.default is None:
-            return SQL("{} TIMESTAMP").format(Identifier(self.name))
+            return SQL("{} TIMESTAMP UNIQUE" if self.unique else "{} TIMESTAMP").format(
+                Identifier(self.name)
+            )
         else:
             return SQL("{} TIMESTAMP DEFAULT {}").format(
                 Identifier(self.name), Literal(self.default)
             )
 
     def serialize(self):
-        return f"{self.name}:datetime"
+        return f"{self.name}:datetime{':unique' if self.unique else ''}{':default' if self.default is not None else ''}"
 
 
 class DoubleColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: float | None = None):
-        super().__init__(name)
+    def __init__(self, name: str, default: float | None = None, unique: bool = False):
+        if default is not None and unique:
+            raise ValueError("Cannot have a default value and be unique")
+        super().__init__(name, unique)
         self.default = default
 
     def sql(self):
         if self.default is None:
-            return SQL("{} DOUBLE PRECISION").format(Identifier(self.name))
+            return SQL(
+                "{} DOUBLE PRECISION UNIQUE" if self.unique else "{} DOUBLE PRECISION"
+            ).format(Identifier(self.name))
         else:
             return SQL("{} DOUBLE PRECISION DEFAULT {}").format(
                 Identifier(self.name), Literal(self.default)
             )
 
     def serialize(self):
-        return f"{self.name}:float"
+        return f"{self.name}:float{':unique' if self.unique else ''}{':default' if self.default is not None else ''}"
 
 
 class IntegerColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: int | None = None):
-        super().__init__(name)
+    def __init__(self, name: str, default: int | None = None, unique: bool = False):
+        if default is not None and unique:
+            raise ValueError("Cannot have a default value and be unique")
+        super().__init__(name, unique)
         self.default = default
 
     def sql(self):
         if self.default is None:
-            return SQL("{} INTEGER").format(Identifier(self.name))
+            return SQL("{} INTEGER UNIQUE" if self.unique else "{} INTEGER").format(
+                Identifier(self.name)
+            )
         else:
             return SQL("{} INTEGER DEFAULT {}").format(
                 Identifier(self.name), Literal(self.default)
             )
 
     def serialize(self):
-        return f"{self.name}:int"
-
-
-class UUIDColumnDefinition(ColumnDefinition):
-    def __init__(self, name: str, default: str | None = None):
-        super().__init__(name)
-        self.default = default
-
-    def sql(self):
-        if self.default is None:
-            return SQL("{} UUID").format(Identifier(self.name))
-        else:
-            return SQL("{} UUID DEFAULT {}").format(
-                Identifier(self.name), Literal(self.default)
-            )
-
-    def serialize(self):
-        return f"{self.name}:uuid"
+        return f"{self.name}:int{':unique' if self.unique else ''}{':default' if self.default is not None else ''}"
diff --git a/src/based/db.py b/src/based/db.py
index da2ba17..28f189d 100644
--- a/src/based/db.py
+++ b/src/based/db.py
@@ -1,4 +1,4 @@
-from typing import Any
+from typing import Any, Literal as _Literal
 from psycopg import Connection
 from psycopg.rows import dict_row
 from psycopg.sql import SQL, Identifier, Literal
@@ -13,26 +13,80 @@ class _ExtendedConnection(Connection):
         self.row_factory = dict_row
 
 
+CONDITION_OPERATORS = _Literal[
+    "eq",
+    "ne",
+    "gt",
+    "lt",
+    "ge",
+    "le",
+    "contains",
+    "not_contains",
+    "starts_with",
+    "not_starts_with",
+    "ends_with",
+    "not_ends_with",
+]
+
+
 class ColumnCondition:
-    def __init__(
-        self, column: str, value: Any, isString: bool = False, isLike: bool = True
-    ):
+    def __init__(self, column: str, operator: CONDITION_OPERATORS, value: Any):
         self.column = column
+        self.operator = operator
         self.value = value
-        self.isString = isString
-        self.isLike = isLike
 
     def sql(self):
-        if self.isString:
-            if self.isLike:
+        match self.operator:
+            case "eq":
+                return SQL("{} = {}").format(
+                    Identifier(self.column), Literal(self.value)
+                )
+            case "ne":
+                return SQL("{} != {}").format(
+                    Identifier(self.column), Literal(self.value)
+                )
+            case "gt":
+                return SQL("{} > {}").format(
+                    Identifier(self.column), Literal(self.value)
+                )
+            case "lt":
+                return SQL("{} < {}").format(
+                    Identifier(self.column), Literal(self.value)
+                )
+            case "ge":
+                return SQL("{} >= {}").format(
+                    Identifier(self.column), Literal(self.value)
+                )
+            case "le":
+                return SQL("{} <= {}").format(
+                    Identifier(self.column), Literal(self.value)
+                )
+            case "contains":
                 return SQL("{} LIKE {}").format(
                     Identifier(self.column), Literal(self.value)
                 )
-            else:
+            case "not_contains":
                 return SQL("{} NOT LIKE {}").format(
                     Identifier(self.column), Literal(self.value)
                 )
-        return SQL("{} = {}").format(Identifier(self.column), Literal(self.value))
+            case "starts_with":
+                return SQL("{} LIKE {}").format(
+                    Identifier(self.column), Literal(f"{self.value}%")
+                )
+            case "not_starts_with":
+                return SQL("{} NOT LIKE {}").format(
+                    Identifier(self.column), Literal(f"{self.value}%")
+                )
+            case "ends_with":
+                return SQL("{} LIKE {}").format(
+                    Identifier(self.column), Literal(f"%{self.value}")
+                )
+            case "not_ends_with":
+                return SQL("{} NOT LIKE {}").format(
+                    Identifier(self.column), Literal(f"%{self.value}")
+                )
+            case _:
+                raise ValueError(f"Unknown operator: {self.operator}")
 
 
 class ColumnUpdate:
@@ -50,7 +104,7 @@ class DBConnector:
 
         if not self.__tableExistsInternal("tables_metadata"):
             columns = [
-                PrimaryUUIDColumnDefinition("table_id"),
+                PrimarySerialColumnDefinition("table_id"),
                 TextColumnDefinition("table_name"),
                 TextColumnDefinition("columns"),
                 BooleanColumnDefinition("system", False),
@@ -58,6 +112,7 @@ class DBConnector:
             ]
             self.createTable("tables_metadata", columns, system=True, hidden=True)
 
+    @property
     def connection(self):
         return self._pool.connection()
 
@@ -81,12 +136,12 @@ class DBConnector:
     def removeTableMetadata(self, table_name: str):
         self.deleteFromTable(
             "tables_metadata",
-            [ColumnCondition("table_name", table_name, isString=True, isLike=True)],
+            [ColumnCondition("table_name", "eq", table_name)],
         )
 
     def tables(self):
         stmt = SQL("SELECT * FROM tables_metadata")
-        with self.connection() as conn:
+        with self.connection as conn:
             return conn.execute(stmt).fetchall()
 
     def tableExists(self, table_name: str):
@@ -99,7 +154,7 @@ class DBConnector:
             )
             """
         ).format(Literal(table_name))
-        with self.connection() as conn:
+        with self.connection as conn:
             result = conn.execute(stmt).fetchone()
             return False if result is None else result["exists"]
 
@@ -113,7 +168,7 @@ class DBConnector:
             )
             """
         ).format(Literal(table_name))
-        with self.connection() as conn:
+        with self.connection as conn:
             result = conn.execute(stmt).fetchone()
             return False if result is None else result["exists"]
 
@@ -127,13 +182,13 @@ class DBConnector:
         stmt = SQL("CREATE TABLE IF NOT EXISTS {} ({})").format(
             Identifier(table_name), SQL(", ").join(map(lambda c: c.sql(), columns))
         )
-        with self.connection() as conn:
+        with self.connection as conn:
             conn.execute(stmt)
         self.saveTableMetadata(table_name, columns, system, hidden)
 
     def dropTable(self, table_name: str):
         stmt = SQL("DROP TABLE IF EXISTS {}").format(Identifier(table_name))
-        with self.connection() as conn:
+        with self.connection as conn:
             conn.execute(stmt)
         self.removeTableMetadata(table_name)
 
@@ -141,7 +196,7 @@ class DBConnector:
         stmt = SQL("SELECT * FROM tables_metadata WHERE table_name = {}").format(
             Literal(table_name)
         )
-        with self.connection() as conn:
+        with self.connection as conn:
             return conn.execute(stmt).fetchone()
 
     def insertIntoTable(self, table_name: str, columns: dict[str, Any]):
@@ -153,7 +208,7 @@ class DBConnector:
                 SQL(", ").join(map(lambda c: Identifier(c), columns.keys())),
                 SQL(", ").join(map(lambda c: Literal(c), columns.values())),
             )
-        with self.connection() as conn:
+        with self.connection as conn:
             conn.execute(stmt)
 
     def selectFromTable(
@@ -166,7 +221,7 @@ class DBConnector:
                 SQL(", ").join(map(lambda c: Identifier(c), columns)),
                 Identifier(table_name),
             )
-        with self.connection() as conn:
+        with self.connection as conn:
             return conn.execute(stmt).fetchall()
 
     def filterFromTable(
@@ -183,7 +238,7 @@ class DBConnector:
                 Identifier(table_name),
                 SQL(" AND ").join(map(lambda cp: cp.sql(), where)),
             )
-        with self.connection() as conn:
+        with self.connection as conn:
             return conn.execute(stmt).fetchall()
 
     def updateDataInTable(
@@ -194,7 +249,7 @@ class DBConnector:
             SQL(", ").join(map(lambda cp: cp.sql(), columns)),
             SQL(" AND ").join(map(lambda cp: cp.sql(), where)),
         )
-        with self.connection() as conn:
+        with self.connection as conn:
             conn.execute(stmt)
 
     def selectJoinedTables(
@@ -209,7 +264,7 @@ class DBConnector:
             Identifier(join_table),
             Identifier(join_column),
         )
-        with self.connection() as conn:
+        with self.connection as conn:
             return conn.execute(stmt).fetchall()
 
     def deleteFromTable(self, table_name: str, where: list[ColumnCondition]):
@@ -217,5 +272,5 @@ class DBConnector:
             Identifier(table_name),
             SQL(" AND ").join(map(lambda cp: cp.sql(), where)),
         )
-        with self.connection() as conn:
+        with self.connection as conn:
             conn.execute(stmt)