由于现场经常出现不写where条件,删了全表的数据,因此为了防止误删,lxdb默认限制不写任何条件的全表删除,会主动抛错,如果想全表删除,需通过truncate_table_match标记来删

delete from  lxdb_key_val  where i2=4;
delete from  lxdb_key_val  where i2>7;
--清理全表数据 truncate()
delete from lxdb_key_val where truncate_table_match(txt1);
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