mysql> SELECT @@innodb_version;
+------------------+
| @@innodb_version |
+------------------+
| 5.6.31 |
+------------------+
mysql> SELECT @@version;
+-------------------------+
| @@version |
+-------------------------+
| 5.6.31-0ubuntu0.15.10.1 |
+-------------------------+
mysql> SELECT version();
+-------------------------+
| version() |
+-------------------------+
| 5.6.31-0ubuntu0.15.10.1 |
+-------------------------+
mysql> SELECT @@GLOBAL.VERSION;
+------------------+
| @@GLOBAL.VERSION |
+------------------+
| 8.0.27 |
+------------------+Source: SQL Injection/MySQL Injection.md in PayloadsAllTheThings. From PayloadsAllTheThings by Swissky and contributors. MIT License, Copyright (c) 2019 Swissky.