diff --git a/src/Concept/Database/Query.php b/src/Concept/Database/Query.php
new file mode 100644
index 0000000..6a325ee
--- /dev/null
+++ b/src/Concept/Database/Query.php
@@ -0,0 +1,8 @@
+<?php
+namespace ProVM\Concept\Database;
+
+interface Query
+{
+    public function build(): string;
+    public function __toString(): string;
+}
diff --git a/src/Concept/Database/Query/Delete.php b/src/Concept/Database/Query/Delete.php
new file mode 100644
index 0000000..e3a8f2d
--- /dev/null
+++ b/src/Concept/Database/Query/Delete.php
@@ -0,0 +1,10 @@
+<?php
+namespace ProVM\Concept\Database\Query;
+
+use ProVM\Concept\Database\Query;
+
+interface Delete extends Query
+{
+    public function from(string $table): Delete;
+    public function where(array $conditions): Delete;
+}
diff --git a/src/Concept/Database/Query/Insert.php b/src/Concept/Database/Query/Insert.php
new file mode 100644
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--- /dev/null
+++ b/src/Concept/Database/Query/Insert.php
@@ -0,0 +1,12 @@
+<?php
+namespace ProVM\Concept\Database\Query;
+
+use ProVM\Concept\Database\Query;
+
+interface Insert extends Query
+{
+    public function into(string $table): Insert;
+    public function columns(array $columns): Insert;
+    public function values(array $values): Insert;
+    public function select(Select $select): Insert;
+}
diff --git a/src/Concept/Database/Query/Select.php b/src/Concept/Database/Query/Select.php
new file mode 100644
index 0000000..4aef050
--- /dev/null
+++ b/src/Concept/Database/Query/Select.php
@@ -0,0 +1,15 @@
+<?php
+namespace ProVM\Concept\Database\Query;
+
+use ProVM\Concept\Database\Query;
+
+interface Select extends Query
+{
+    public function select(array $columns = ['*']): Select;
+    public function from(string $table): Select;
+    public function joins(array $joins): Select;
+    public function where(array $conditions): Select;
+    public function groupBy(array $grouping): Select;
+    public function having(array $having): Select;
+    public function orderBy(array $ordering): Select;
+}
diff --git a/src/Concept/Database/Query/Update.php b/src/Concept/Database/Query/Update.php
new file mode 100644
index 0000000..87b769a
--- /dev/null
+++ b/src/Concept/Database/Query/Update.php
@@ -0,0 +1,11 @@
+<?php
+namespace ProVM\Concept\Database\Query;
+
+use ProVM\Concept\Database\Query;
+
+interface Update extends Query
+{
+    public function table(string $table): Update;
+    public function set(array $value_pairs): Update;
+    public function where(array $conditions): Update;
+}
diff --git a/src/Concept/Database/QueryBuilder.php b/src/Concept/Database/QueryBuilder.php
new file mode 100644
index 0000000..81a4a81
--- /dev/null
+++ b/src/Concept/Database/QueryBuilder.php
@@ -0,0 +1,15 @@
+<?php
+namespace ProVM\Concept\Database;
+
+use Psr\Container\ContainerInterface;
+use ProVM\Concept\Database\Query\{Delete,Insert,Select,Update};
+
+interface QueryBuilder
+{
+    public function setContainer(ContainerInterface $container): QueryBuilder;
+    public function getContainer(): ContainerInterface;
+    public function select(array $columns = ['*']): Select;
+    public function insert(string $table): Insert;
+    public function update(string $table): Update;
+    public function delete(string $table): Delete;
+}