第2步—准备和绑定expcat . sqc文件，它会为主查询创建包。

Step 2 - Prepare and bind the expcat.sqc file, which will create the packages for the main query.

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以上查询包含一个相关子查询，因为主查询和子查询依靠于同一个表，即employees表。

The query above contains a correlated subquery, since the main query and the subquery are relaying on the same table, the employees table.

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