Start by changing the single query to two queries, with the outside query looping through each user see Listing 6.

首先将单个的查询变为两个查询，用outside查询在每个用户间进行循环。

youdao

Start by changing the single query to two queries, with the outside query looping through each user see Listing 6.

首先将单个的查询变为两个查询，用outside查询在每个用户间进行循环。

youdao