如何将PostgreSQL的`:: FLOAT`转换为MariaDB

Question

我正在努力将PostgreSQL查询转换为MariaDB，需要帮助来了解如何在PostgreSQL中重写此行：

   retained_users / MAX(CASE WHEN user_period = 0
         THEN retained_users
         ELSE NULL END)
   OVER (PARTITION BY "Signup Date")::FLOAT AS retention_rate,

MariaDB无法理解::FLOAT-如何为MariaDB重写它？

Answer 1

嗯。 。 。这够吗？

(retained_users /
 MAX(CASE WHEN user_period = 0 THEN retained_users*1.0 END) OVER (PARTITION BY "Signup Date")
) AS retention_rate,