array_agg(expression) --输入参数为任何数组类型 1. 第一种array_agg函数的输入参数为任何非数组类型,这里输入参数为任何数组类型,返回类型为多维数组: 首先创建数组表。 mydb=> CREATE TABLE test_array3(id int4[]); CREATE TABLE mydb=> INSERT INTO test_array3(id) VALUES (array[1,2,3]); INSERT...
(1 row) select string_agg(id::text, '-' order by id) filter (where id<100) from test group by c1; string_agg(表达式,分隔符);将一个表达式变成字符串 array_agg(表达式),将表达式变成一个数组,一般配合array_to_string()使用 postgres=# select id,c1 from test where c1=8 limit 20; id |...
4.0 版后已移除: 如果没有行,并且没有提供 default,ArrayAgg 会返回一个空列表,而不是 None。这个行为已被废弃,并将在 Django 5.0 中被删除。如果你需要它,请明确设置 default 为Value([])。 BitAnd¶ class BitAnd(expression, filter=None, default=None, **extra)¶ 返回所有非空输入值的位式 AND ...
-- -- Filter an array of events such that there is only one event with each event_id. -- When more than one event with the same event_id is present, take the latest one. CREATE OR REPLACE FUNCTIONdedupe_events_1(events HSTORE[]) RETURNS HSTORE[] AS $$ SELECTarray_agg(event)FROM...
一、 最高效方法 测试环境验证,6600万行大表,删除2200万重复数据仅需3分钟 delete from deltest a where a.ctid = any(array (select ctid from (select row_number() over (partition by id)
topn gzip zstd http pg_net pg_smtp_client pg_html5_email_address pgsql_tweaks pg_extra_time timeit count_distinct extra_window_functions first_last_agg tdigest aggs_for_vecs aggs_for_arrays arraymath quantile lower_quantile pg_idkit pg_uuidv7 permuteseq pg_hashids sequential_uuids pg_math...
-- Filter an array of events such that there is only one event with each event_id.-- When more than one event with the same event_id, is present, take the latest one.CREATEORREPLACEFUNCTIONdedupe_events_2(events HSTORE[])RETURNSHSTORE[]AS$$SELECTarray_agg(event)FROM(-- Filter for ...
entry */42float4 procost;/* estimated execution cost */43float4 prorows;/* estimated # of rows out (if proretset) */44Oid provariadic;/* element type of variadic array, or 0 */45regproc protransform;/* transforms calls to it during planning */46bool proisagg;/* is it an ...
array_agg(i::date) from generate_series('2015-12-01'::date, '2015-12-30'::date, '1 day'::interval) as t(i) )[floor(random()*4)+1] as date_key, floor(random()*24) as hour_key, floor(random()*1000000)+1 as client_key, ...
COALESCE((SELECT to_json( array_agg(transformed_payment_in_record_details) ) FROM transformed_payment_in_record_details WHERE t1.object_id = transformed_payment_in_record_details.payment_in_record_id), '[]') AS details, 所以我有三张桌子 payment_in_records payment_in_record_details external_...