diff --git a/.phpstan-dba-mysqli.cache b/.phpstan-dba-mysqli.cache
index 9c696337a..e36d9741e 100644
--- a/.phpstan-dba-mysqli.cache
+++ b/.phpstan-dba-mysqli.cache
@@ -471,6 +471,78 @@
         )),
       ),
     ),
+    'SELECT
+        CASE
+            WHEN freigabe1u1 > 50 THEN \'big-one\'
+            WHEN freigabe1u1 = 50 THEN \'normal\'
+            ELSE freigabe1u1
+        END as val from ada' => 
+    array (
+      'result' => 
+      array (
+        5 => 
+        PHPStan\Type\Constant\ConstantArrayType::__set_state(array(
+           'keyType' => 
+          PHPStan\Type\UnionType::__set_state(array(
+             'sortedTypes' => true,
+             'cachedDescriptions' => 
+            array (
+              2 => '0|\'val\'',
+            ),
+             'types' => 
+            array (
+              0 => 
+              PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+                 'value' => 0,
+              )),
+              1 => 
+              PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+                 'objectType' => NULL,
+                 'arrayKeyType' => NULL,
+                 'value' => 'val',
+                 'isClassString' => false,
+              )),
+            ),
+             'normalized' => false,
+          )),
+           'itemType' => 
+          PHPStan\Type\StringType::__set_state(array(
+          )),
+           'allArrays' => NULL,
+           'nextAutoIndexes' => 
+          array (
+            0 => 1,
+          ),
+           'keyTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+               'objectType' => NULL,
+               'arrayKeyType' => NULL,
+               'value' => 'val',
+               'isClassString' => false,
+            )),
+            1 => 
+            PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+               'value' => 0,
+            )),
+          ),
+           'valueTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+            1 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+          ),
+           'optionalKeys' => 
+          array (
+          ),
+           'isList' => false,
+        )),
+      ),
+    ),
     'SELECT
                     coalesce(COLUMN_NAME, "") as COLUMN_NAME,
                     coalesce(EXTRA, "") as EXTRA,
@@ -2092,6 +2164,86 @@
         )),
       ),
     ),
+    'SELECT CASE
+            WHEN freigabe1u1 > 50 THEN \'big-one\'
+            WHEN freigabe1u1 = 50 THEN \'normal
+            ELSE \'more\' END as val from ada' => 
+    array (
+      'error' => 
+      staabm\PHPStanDba\Error::__set_state(array(
+         'message' => 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL/MariaDB server version for the right syntax to use near \'more\' END as val from ada LIMIT 0\' at line 4',
+         'code' => 1064,
+      )),
+    ),
+    'SELECT CASE
+            WHEN freigabe1u1 > 50 THEN \'big-one\'
+            WHEN freigabe1u1 = 50 THEN \'two\' ELSE \'more\' END as val from ada' => 
+    array (
+      'result' => 
+      array (
+        5 => 
+        PHPStan\Type\Constant\ConstantArrayType::__set_state(array(
+           'keyType' => 
+          PHPStan\Type\UnionType::__set_state(array(
+             'sortedTypes' => true,
+             'cachedDescriptions' => 
+            array (
+              2 => '0|\'val\'',
+            ),
+             'types' => 
+            array (
+              0 => 
+              PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+                 'value' => 0,
+              )),
+              1 => 
+              PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+                 'objectType' => NULL,
+                 'arrayKeyType' => NULL,
+                 'value' => 'val',
+                 'isClassString' => false,
+              )),
+            ),
+             'normalized' => false,
+          )),
+           'itemType' => 
+          PHPStan\Type\StringType::__set_state(array(
+          )),
+           'allArrays' => NULL,
+           'nextAutoIndexes' => 
+          array (
+            0 => 1,
+          ),
+           'keyTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+               'objectType' => NULL,
+               'arrayKeyType' => NULL,
+               'value' => 'val',
+               'isClassString' => false,
+            )),
+            1 => 
+            PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+               'value' => 0,
+            )),
+          ),
+           'valueTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+            1 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+          ),
+           'optionalKeys' => 
+          array (
+          ),
+           'isList' => false,
+        )),
+      ),
+    ),
     'SELECT CASE 1 WHEN 1 THEN \'one\' WHEN 2 THEN \'two\' ELSE \'more\' END as val from ada' => 
     array (
       'result' => 
diff --git a/src/SqlAst/QueryScope.php b/src/SqlAst/QueryScope.php
index 6c35b14aa..62de1c29a 100644
--- a/src/SqlAst/QueryScope.php
+++ b/src/SqlAst/QueryScope.php
@@ -12,7 +12,9 @@
 use PHPStan\Type\MixedType;
 use PHPStan\Type\NullType;
 use PHPStan\Type\Type;
+use PHPStan\Type\TypeCombinator;
 use SqlFtw\Sql\Expression\BoolValue;
+use SqlFtw\Sql\Expression\CaseExpression;
 use SqlFtw\Sql\Expression\ExpressionNode;
 use SqlFtw\Sql\Expression\FunctionCall;
 use SqlFtw\Sql\Expression\Identifier;
@@ -112,6 +114,15 @@ public function getType($expression): Type
             throw new ShouldNotHappenException('Unable to resolve column '.$expression->getName());
         }
 
+        if ($expression instanceof CaseExpression) {
+            $resultTypes = [];
+            foreach ($expression->getResults() as $result) {
+                $resultTypes[] = $this->getType($result);
+            }
+
+            return TypeCombinator::union(...$resultTypes);
+        }
+
         if ($expression instanceof FunctionCall) {
             foreach ($this->extensions as $extension) {
                 if (!$extension->isFunctionSupported($expression)) {
diff --git a/tests/default/config/.phpunit-phpstan-dba-mysqli.cache b/tests/default/config/.phpunit-phpstan-dba-mysqli.cache
index 478c1f318..e90705429 100644
--- a/tests/default/config/.phpunit-phpstan-dba-mysqli.cache
+++ b/tests/default/config/.phpunit-phpstan-dba-mysqli.cache
@@ -91,6 +91,78 @@
         )),
       ),
     ),
+    'SELECT
+        CASE
+            WHEN freigabe1u1 > 50 THEN \'big-one\'
+            WHEN freigabe1u1 = 50 THEN \'normal\'
+            ELSE freigabe1u1
+        END as val from ada' => 
+    array (
+      'result' => 
+      array (
+        5 => 
+        PHPStan\Type\Constant\ConstantArrayType::__set_state(array(
+           'keyType' => 
+          PHPStan\Type\UnionType::__set_state(array(
+             'sortedTypes' => true,
+             'cachedDescriptions' => 
+            array (
+              2 => '0|\'val\'',
+            ),
+             'types' => 
+            array (
+              0 => 
+              PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+                 'value' => 0,
+              )),
+              1 => 
+              PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+                 'objectType' => NULL,
+                 'arrayKeyType' => NULL,
+                 'value' => 'val',
+                 'isClassString' => false,
+              )),
+            ),
+             'normalized' => false,
+          )),
+           'itemType' => 
+          PHPStan\Type\StringType::__set_state(array(
+          )),
+           'allArrays' => NULL,
+           'nextAutoIndexes' => 
+          array (
+            0 => 1,
+          ),
+           'keyTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+               'objectType' => NULL,
+               'arrayKeyType' => NULL,
+               'value' => 'val',
+               'isClassString' => false,
+            )),
+            1 => 
+            PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+               'value' => 0,
+            )),
+          ),
+           'valueTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+            1 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+          ),
+           'optionalKeys' => 
+          array (
+          ),
+           'isList' => false,
+        )),
+      ),
+    ),
     'SELECT
                 adaid
             FROM
@@ -3526,6 +3598,73 @@
         )),
       ),
     ),
+    'SELECT CASE 1 WHEN 1 THEN \'one\' WHEN 2 THEN \'two\' ELSE \'more\' END as val from ada' => 
+    array (
+      'result' => 
+      array (
+        5 => 
+        PHPStan\Type\Constant\ConstantArrayType::__set_state(array(
+           'keyType' => 
+          PHPStan\Type\UnionType::__set_state(array(
+             'sortedTypes' => true,
+             'cachedDescriptions' => 
+            array (
+              2 => '0|\'val\'',
+            ),
+             'types' => 
+            array (
+              0 => 
+              PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+                 'value' => 0,
+              )),
+              1 => 
+              PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+                 'objectType' => NULL,
+                 'arrayKeyType' => NULL,
+                 'value' => 'val',
+                 'isClassString' => false,
+              )),
+            ),
+             'normalized' => false,
+          )),
+           'itemType' => 
+          PHPStan\Type\StringType::__set_state(array(
+          )),
+           'allArrays' => NULL,
+           'nextAutoIndexes' => 
+          array (
+            0 => 1,
+          ),
+           'keyTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+               'objectType' => NULL,
+               'arrayKeyType' => NULL,
+               'value' => 'val',
+               'isClassString' => false,
+            )),
+            1 => 
+            PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+               'value' => 0,
+            )),
+          ),
+           'valueTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+            1 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+          ),
+           'optionalKeys' => 
+          array (
+          ),
+           'isList' => false,
+        )),
+      ),
+    ),
     'SELECT COALESCE(freigabe1u1) as col from ada' => 
     array (
       'result' => 
diff --git a/tests/default/config/.phpunit-phpstan-dba-pdo-mysql.cache b/tests/default/config/.phpunit-phpstan-dba-pdo-mysql.cache
index f34d610f9..c4dd815dd 100644
--- a/tests/default/config/.phpunit-phpstan-dba-pdo-mysql.cache
+++ b/tests/default/config/.phpunit-phpstan-dba-pdo-mysql.cache
@@ -91,6 +91,78 @@
         )),
       ),
     ),
+    'SELECT
+        CASE
+            WHEN freigabe1u1 > 50 THEN \'big-one\'
+            WHEN freigabe1u1 = 50 THEN \'normal\'
+            ELSE freigabe1u1
+        END as val from ada' => 
+    array (
+      'result' => 
+      array (
+        5 => 
+        PHPStan\Type\Constant\ConstantArrayType::__set_state(array(
+           'keyType' => 
+          PHPStan\Type\UnionType::__set_state(array(
+             'sortedTypes' => true,
+             'cachedDescriptions' => 
+            array (
+              2 => '0|\'val\'',
+            ),
+             'types' => 
+            array (
+              0 => 
+              PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+                 'value' => 0,
+              )),
+              1 => 
+              PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+                 'objectType' => NULL,
+                 'arrayKeyType' => NULL,
+                 'value' => 'val',
+                 'isClassString' => false,
+              )),
+            ),
+             'normalized' => false,
+          )),
+           'itemType' => 
+          PHPStan\Type\StringType::__set_state(array(
+          )),
+           'allArrays' => NULL,
+           'nextAutoIndexes' => 
+          array (
+            0 => 1,
+          ),
+           'keyTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+               'objectType' => NULL,
+               'arrayKeyType' => NULL,
+               'value' => 'val',
+               'isClassString' => false,
+            )),
+            1 => 
+            PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+               'value' => 0,
+            )),
+          ),
+           'valueTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+            1 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+          ),
+           'optionalKeys' => 
+          array (
+          ),
+           'isList' => false,
+        )),
+      ),
+    ),
     'SELECT
                 adaid
             FROM
@@ -3526,6 +3598,73 @@
         )),
       ),
     ),
+    'SELECT CASE 1 WHEN 1 THEN \'one\' WHEN 2 THEN \'two\' ELSE \'more\' END as val from ada' => 
+    array (
+      'result' => 
+      array (
+        5 => 
+        PHPStan\Type\Constant\ConstantArrayType::__set_state(array(
+           'keyType' => 
+          PHPStan\Type\UnionType::__set_state(array(
+             'sortedTypes' => true,
+             'cachedDescriptions' => 
+            array (
+              2 => '0|\'val\'',
+            ),
+             'types' => 
+            array (
+              0 => 
+              PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+                 'value' => 0,
+              )),
+              1 => 
+              PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+                 'objectType' => NULL,
+                 'arrayKeyType' => NULL,
+                 'value' => 'val',
+                 'isClassString' => false,
+              )),
+            ),
+             'normalized' => false,
+          )),
+           'itemType' => 
+          PHPStan\Type\StringType::__set_state(array(
+          )),
+           'allArrays' => NULL,
+           'nextAutoIndexes' => 
+          array (
+            0 => 1,
+          ),
+           'keyTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\Constant\ConstantStringType::__set_state(array(
+               'objectType' => NULL,
+               'arrayKeyType' => NULL,
+               'value' => 'val',
+               'isClassString' => false,
+            )),
+            1 => 
+            PHPStan\Type\Constant\ConstantIntegerType::__set_state(array(
+               'value' => 0,
+            )),
+          ),
+           'valueTypes' => 
+          array (
+            0 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+            1 => 
+            PHPStan\Type\StringType::__set_state(array(
+            )),
+          ),
+           'optionalKeys' => 
+          array (
+          ),
+           'isList' => false,
+        )),
+      ),
+    ),
     'SELECT COALESCE(freigabe1u1) as col from ada' => 
     array (
       'result' => 
diff --git a/tests/default/data/sql-ast-narrowing.php b/tests/default/data/sql-ast-narrowing.php
index 032997228..0f4ef4151 100644
--- a/tests/default/data/sql-ast-narrowing.php
+++ b/tests/default/data/sql-ast-narrowing.php
@@ -83,6 +83,20 @@ public function if(PDO $pdo): void
         assertType("PDOStatement<array{col: 'a'|'b'|'other', 0: 'a'|'b'|'other'}>", $stmt);
     }
 
+    public function caseWhen(PDO $pdo): void
+    {
+        $stmt = $pdo->query("SELECT CASE 1 WHEN 1 THEN 'one' WHEN 2 THEN 'two' ELSE 'more' END as val from ada");
+        assertType("PDOStatement<array{val: 'more'|'one'|'two', 0: 'more'|'one'|'two'}>", $stmt);
+
+        $stmt = $pdo->query("SELECT
+        CASE
+            WHEN freigabe1u1 > 50 THEN 'big-one'
+            WHEN freigabe1u1 = 50 THEN 'normal'
+            ELSE freigabe1u1
+        END as val from ada");
+        assertType("PDOStatement<array{val: 'big-one'|'normal'|int<-128, 127>, 0: 'big-one'|'normal'|int<-128, 127>}>", $stmt); // could be 'big-one'|'normal'|int<-128, 49>
+    }
+
     public function concat(PDO $pdo): void
     {
         $stmt = $pdo->query('SELECT concat(akid, 5000) as col from ak');