ELSIF ( NEW.logdate >= DATE '2022-04-01' AND NEW.logdate < DATE '2022-05-01' ) THEN INSERT INTO measurement_2022_4 VALUES (NEW.*); ELSE RAISE EXCEPTION 'Date out of range. Fix the measurement_insert_trigger() function!'; END IF; RETURN NULL; END; $$ LANGUAGE plpgsql; 1. 2....
NULLIF –return NULL if the first argument equals the second one. CAST –convert from one data type into another e.g., from a string into an integer, from a string into a date. Section 16. PostgreSQL Utilities psql commands –show you the most common psql commands that help you interact...
TABLESPACE fasttablespace;ALTERTABLEmeasurement_y2008m02ADDCONSTRAINTy2008m02CHECK( logdate>=DATE'2008-02-01'ANDlogdate<DATE'2008-03-01');ALTERTABLEmeasurement ATTACHPARTITIONmeasurement_y2008m02FORVALUESFROM('2008-02-01')TO('2008-03-01'); ATTACH PARTITION 命令需要对分区表使用 SHARE UPDATE EXCLUSIVE...
例:create table postgtest (id serial primary key,title varchar(255) not null, content text check(length(content) > 3),is_draft boolean default true , create_date timestamp default 'now'); 插入 INSERT INTO TABLE_NAME (column1, column2, column3,...columnN)VALUES (value1, value2, value...
city_idintnotnull, logdate datenotnull, peaktempint, unitsalesint) PARTITIONBYRANGE (logdate); 2、创建分区表 CREATETABLEmeasurement_200711 PARTITIONOFmeasurementFORVALUESFROM('2007-11-01')TO('2007-12-01');CREATETABLEmeasurement_200712 PARTITIONOFmeasurementFORVALUESFROM('2007-12-01')TO('2008-01...
) showuseage exit 1 ;; esac done BAKUP_SQL=" create table if not exists pg_log_:bak_log_span as select :today::varchar(8) as bak_date ,* from pg_log where 1 = 2 ; delete from pg_log_:bak_log_span where to_char(log_time,'yyyymmdd')::numeric = ${BAKUP_DATE} ; insert ...
check ( join_date >= DATE '2013-05-01' AND join_date ) INHERITS (tbl_partition); CREATE TABLE david=# 3.3 分区键上建索引 david=# create index tbl_partition_201211_joindate on tbl_partition_201211 (join_date); CREATE INDEX david=# create index tbl_partition_201212_joindate on tbl_part...
但需要注意的是,此种方式由于比较直接,不管是否数据库有无IO情况,因此,备份的时候需要先停止数据库,恢复的时候要删除原数据库文件,重新覆盖回去后,才可以在启动数据库,如果在数据库启动的时候备份,那么,可能会造成数据备份不全,也可以理解为冷备方式。
(1, 'UPS', current_date); INSERT INTO warehouse values (2, 'TV', current_date); INSERT INTO warehouse values (3, 'Table', current_date); -- 查询数据 SELECT * FROM warehouse ORDER BY 1; warehouse_id | warehouse_name | warehouse_created ---+---+--- 1 | UPS | 10-J...
A trigger function must return either NULL or a record/row value having exactly the structure of the table the trigger was fired for. 以plpgsql为例,触发器函数范例。 使用hstore 和触发器跟踪敏感数据的DML。 创建需要被跟踪的测试表 CREATE TABLE test (id int primary key, info text, crt_time ...