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最新推荐文章于 2024-11-15 09:15:17 发布

jsboy123

最新推荐文章于 2024-11-15 09:15:17 发布

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分类专栏： SQL 文章标签： pgsql

本文链接：https://blog.youkuaiyun.com/jsboy123/article/details/121906981

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这篇博客介绍了如何在数据库中创建并发索引，并提供了查询TimescaleDB版本的SQL语句。同时，还定义了一个PL/pgSQL函数，用于获取特定时间范围内的分区表名称。

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创建并发索引

create index on tbl_real_time_data(tm,monitor_factor_code) WITH (timescaledb.transaction_per_chunk

查看timescaleDB版本

SELECT extversion
FROM pg_extension
where extname = 'timescaledb';

--查询分区表在哪里表里面

CREATE OR REPLACE FUNCTION "public"."getpartitiontablebytime"("tbl_name" varchar, "tbl_date" varchar)
RETURNS SETOF "pg_catalog"."text" AS $BODY$
DECLARE tbl_name_id text;

BEGIN -- PLPSQL
   --RETURN QUERY (SELECT tt.stcd::TEXT from tbl_device_info tt WHERE id = 485);
   --RETURN QUERY (SELECT associated_table_prefix::TEXT from "_timescaledb_catalog".hypertable where table_name = || tbl_var||);
   -- 根据表名查到ID
   SELECT t1.id::text into tbl_name_id FROM "_timescaledb_catalog"."dimension_slice" t1
inner join "_timescaledb_catalog".hypertable t2 on t1.dimension_id = t2.id and t2.table_name = tbl_name and tbl_date > to_timestamp(range_start/ 1000000.0)::VARCHAR and tbl_date < to_timestamp(range_end/ 1000000.0)::VARCHAR;

--RETURN QUERY tbl_name_id;
--RETURN QUERY (SELECT associated_table_prefix::TEXT+id::text from "_timescaledb_catalog".hypertable where table_name = tbl_name);
RETURN QUERY (SELECT associated_table_prefix::TEXT||'_'||tbl_name_id::text from "_timescaledb_catalog".hypertable where table_name = tbl_name);
END;
$BODY$
LANGUAGE plpgsql