LINE 1: select * from pg_temp_3.tbl_temp ; ^ 示例2.创建ON COMMIT DELETE ROWS的临时表 ; "复制代码") test=# begin ; BEGIN test=# create temp table tbl_temp(a int) on commit delete rows; CREATE TABLE test=# insert into tbl_temp values (1); INSERT 0 1 test=# select * from t...
方法一:创建临时表,再批量导入数据 ---创建临时表CREATETEMPORARYTABLEtemp_table ( idint, namevarchar(50), ageint, )ONCOMMITPRESERVE ROWS;---验证临时表(无数据)SELECT*FROMtemp_table;---批量导入数据INSERTINTOtemp_table( id, name, age )SELECTid, name, ageFROMtarget_table; 这种方法不实用,因为临...
create temp table aaa (c1 int) on commit preserve rows会在提交时保留对 temp table 事务内的更新。 postgres=#begin;BEGINpostgres=*#createtemptableaaa(c1int)oncommitpreserverows;CREATETABLEpostgres=*#insertintoaaavalues(1),(2);INSERT02postgres=*#commit;COMMITpostgres=#select*fromaaa;c1---12(2row...
unlogged table是为临时数据设计的,写入性能较高,但是当postgresql进程崩溃时会丢失数据。 创建一张普通表test和一张unlogged表test,测试性能情况 普通表: test=#createtabletest(aint);CREATETABLEtest=# \timing Timingison. test=#insertintotestselectgenerate_series(1,1000000);INSERT01000000Time:3603.715ms unlogged...
复制表(Replicated Table):复制表是通过将数据复制到多个节点来提供数据冗余和高可用性的表。 这些表类型提供了不同的功能和用途,可以根据具体需求选择合适的表类型来存储和管理数据。 创建表Create Table 命令: 1 2 3 4 5 6 7 8 9 10 11 12 13
create database day26db default charset utf8 collate utf8_general_ci; 1. create table depart( id int not null auto_increment primary key, title varchar(16) not null )default charset=utf8; create table info( id int not null auto_increment primary key, ...
postgres=# \help SELECT Command: SELECT Description: retrieve rows from a table or view Syntax: [ WITH [ RECURSIVE ] with_query [, ...] ] SELECT [ ALL | DISTINCT [ ON ( expression [, ...] ) ] ] [ * | expression [ [ AS ] output_name ] [, ...] ] ...
CREATE UNLOGGED Table log_t (id int, system_info text); SELECT * FROM pg_class WHERE relpersistence = 'u'; 同我们也可以设置将已经unlogged表变为 logged , 通过UNLOGGED 可以模拟GLOBAL 临时表,在使用完毕后,可以直接DROP. 问题3 POSTGRESQL 创建了实体表和临时表的表名是一致的情况下到底访问那个表 ...
You are now connected to database"test"asuser"postgres".test=# create tabletb_mytps(i int,namevarchar(32))tablespace mytbs;CREATETABLE 插入实验数据 代码语言:javascript 复制 insert intotb_mytps(i,name)values(2,'name2');insert intotb_mytps(i,name)values(3,'name3');insert intotb_mytps...
usage---使用权+select查询权 先创建相关schema,名为mytest,相关role,名为test test=# \c testYou are now connected to database "test" as user "postgres".test=# create schema mytest;CREATE SCHEMAtest=# \duList of rolesRole name | Attributes | Member of---+---+---drmc | | {}pg1 |...