下午闲来无事，正巧一个同事问我：给定一个SQL语句字符串，如何用SQL语句来获取这个给定SQL字符串的子查询嵌套层数？
我想了一个思路：获取SQL字符串中所有的括号（成对左右括号里面要包含SELECT关键字），包括左右括号，接下来就是计算左括号的最大深度
SQL如下，感 ...
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