Clickhouse —— PROJECTION 创建物化删除

Posted 2022-09-21 羲凡丞相

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Clickhouse —— PROJECTION 创建物化删除

1、创建

ALTER TABLE db3.data_no_standard_report_new_replica on CLUSTER db3_ck_cluster 
ADD PROJECTION agg_crowd_id
(
	SELECT
		task_id,
		crowd_id,
		uniqExact(multiIf(type = 'imp', caid, NULL)) AS impUV,
		uniqExact(multiIf(type = 'clk', caid, NULL)) AS clkUV,
		sum(multiIf(type = 'imp', 1, 0)) AS impPV,
		sum(multiIf(type = 'clk', 1, 0)) AS clkPV
	GROUP BY
		task_id,
		crowd_id
)

2、物化

ALTER TABLE db3.data_no_standard_report_new_replica on CLUSTER db3_ck_cluster 
MATERIALIZE PROJECTION agg_crowd_id;

3、删除

ALTER TABLE db3.data_no_standard_report_new_replica on CLUSTER db3_ck_cluster 
DROP PROJECTION p_agg_crowd_id;
ALTER TABLE db3.data_no_standard_report_new_replica on CLUSTER db3_ck_cluster 
CLEAR PROJECTION p_agg_crowd_id;

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