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。
Blue provides a single mechanism for looping, which is contained within a code block.
Blue提供单一的循环机制，包含于代码块之内。
Blue provides a single mechanism for looping, which is contained within a code block.
Blue提供单一的循环机制，包含于代码块之内。
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