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device\n+-----------------------------+-----------+--------------+--------------+--------------+\n| Time| Device|last_value(s1)|last_value(s2)|last_value(s3)|\n+-----------------------------+-----------+--------------+--------------+--------------+\n|1970-01-01T08:00:00.001+08:00|root.sg1.d1| 1.0| 2.0| null|\n|1970-01-01T08:00:00.003+08:00|root.sg1.d1| 3.0| 4.0| null|\n|1970-01-01T08:00:00.001+08:00|root.sg1.d2| 1.0| 1.0| 1.0|\n+-----------------------------+-----------+--------------+--------------+--------------+\nTotal line number = 3\nIt costs 0.007s\n")])]),s._v(" "),t("div",{staticClass:"line-numbers-wrapper"},[t("span",{staticClass:"line-number"},[s._v("1")]),t("br"),t("span",{staticClass:"line-number"},[s._v("2")]),t("br"),t("span",{staticClass:"line-number"},[s._v("3")]),t("br"),t("span",{staticClass:"line-number"},[s._v("4")]),t("br"),t("span",{staticClass:"line-number"},[s._v("5")]),t("br"),t("span",{staticClass:"line-number"},[s._v("6")]),t("br"),t("span",{staticClass:"line-number"},[s._v("7")]),t("br"),t("span",{staticClass:"line-number"},[s._v("8")]),t("br"),t("span",{staticClass:"line-number"},[s._v("9")]),t("br"),t("span",{staticClass:"line-number"},[s._v("10")]),t("br")])]),t("p",[s._v("The specified column name corresponds to the column name of the output result. At present, the "),t("code",[s._v("without null")]),s._v(" clause doesn't support specifying a column of a device. 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