语法说明
UPDATE [ ONLY ]tableSETcolumn= {expression| DEFAULT } [, ...] [ FROMfromlist] [ WHEREcondition]
例子：
update table1 t1 set t1. name=t2.name from table2 t2 where t1.id=t2.id and t1.name is null;
gp 数据库批量修改
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