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mysql> SELECT user();
+--------------------------+
| user() |
+--------------------------+
| master_user@app.site.com |
+--------------------------+
mysql> SHOW GRANTS FOR 'master_user';
+-----------------------------------------------------+
| Grants for master_user@% |
+-----------------------------------------------------+
| GRANT USAGE ON *.* TO 'master_user'@'%' |
| GRANT ALL PRIVILEGES ON `db`.* TO 'master_user'@'%' |
+-----------------------------------------------------+
mysql> CREATE USER 'new_user'@'%' IDENTIFIED BY 'pass';
ERROR 1227 (42000): Access denied; you need (at least one of) the CREATE USER privilege(s) for this operation
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