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how to get non null result from yql

my yql syntax is as following:


select a.content from html where url ="http://www.jpmrich.com.tw/wps/portal/!ut/p/c1/04_SB8K8xLLM9MSSzPy8xBz9CP0os3ivgNAAoxBXAwOLAH8XAyMXM3efIP8gA_cgc30_j_zcVP2CbEdF
AG0-u_4!/dl2/d1/L2dJQSEvUUt3QS9ZQnB3LzZfSlBVUDJURTAwR05RRDAyRDFHRkJINzAwSDI!/" and xpath='//table[@class="table_level"]/tr/td' and charset="utf8"


I want to get the a.content which is not null.

how to do that? thanks

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