diff --git a/LeetCode-CN/627.sql b/LeetCode-CN/627.sql
new file mode 100644
index 0000000..1d9cdce
--- /dev/null
+++ b/LeetCode-CN/627.sql
@@ -0,0 +1,4 @@
+    update salary set sex = case sex
+    when 'f' then 'm'
+    when 'm' then 'f'
+    end