如何在TDengine查询中使用state_window
how to use state_window in TDengine query
根据官方文档,查询语法中有一个state_window,如下所示:
SELECT select_expr [, select_expr ...]
FROM {tb_name_list}
[WHERE where_condition]
[SESSION(ts_col, tol_val)]
[STATE_WINDOW(col)]
[INTERVAL(interval_val [, interval_offset]) [SLIDING sliding_val]]
[FILL(fill_mod_and_val)]
[GROUP BY col_list]
[ORDER BY col_list { DESC | ASC }]
[SLIMIT limit_val [SOFFSET offset_val]]
[LIMIT limit_val [OFFSET offset_val]]
[>> export_file];
什么是 state_window 以及如何使用它?
taos网站上有state_window的说明,可以参考:
https://www.taosdata.com/docs/cn/v2.0/taos-sql#aggregation
根据官方文档,查询语法中有一个state_window,如下所示:
SELECT select_expr [, select_expr ...]
FROM {tb_name_list}
[WHERE where_condition]
[SESSION(ts_col, tol_val)]
[STATE_WINDOW(col)]
[INTERVAL(interval_val [, interval_offset]) [SLIDING sliding_val]]
[FILL(fill_mod_and_val)]
[GROUP BY col_list]
[ORDER BY col_list { DESC | ASC }]
[SLIMIT limit_val [SOFFSET offset_val]]
[LIMIT limit_val [OFFSET offset_val]]
[>> export_file];
什么是 state_window 以及如何使用它?
taos网站上有state_window的说明,可以参考: https://www.taosdata.com/docs/cn/v2.0/taos-sql#aggregation