So I have table1 and table2. Table1 has columns configId, timestamp, value. Table2 has configId, machineId, ioid, iotype, lock. The relationship is many Table1 items to 1 Table2 item. Table one is the data, Table2 is the identifiers.So I have table1 and table2. Table1 has columns
阅读背景：
必须连接表但只想从第一个表中删除
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