update_timestampTIMESTAMPDEFAULTCURRENT_TIMESTAMP,--修改时间,默认为当前时间戳 created_byVARCHAR(50)--创建人,存储创建者的用户名或标识);--添加表注释COMMENTONTABLEconf_dept_annual_kpi_import_exportIS'存储供应链进出口年度各个部门年度的基本考核指标';--添加字段注释COMMENTONCOLUMNconf_dept_annual_kpi_im...
-- 设置postgres自增表的日期字段默认值 ALTER TABLE test_c ALTER COLUMN g_created SET DEFAULT CURRENT_TIMESTAMP(3); ALTER TABLE test_c ALTER COLUMN g_modified SET DEFAULT CURRENT_TIMESTAMP(3); -- 删除pgsql自增表的默认值 ALTER TABLE test_c ALTER COLUMN nick_name DROP DEFAULT; 1. 2. 3....
INSERT INTO AUDIT(EMP_ID, ENTRY_DATE) VALUES (new.ID, current_timestamp); RETURN NEW; END; $example_table$ LANGUAGE plpgsql; INDEX 索引 索引是加速搜索引擎检索数据的一种特殊表查询 CREATE UNIQUE INDEX index_name on table_name (column_name); 在COMPANY 表的 SALARY 列上创建索引CREATE INDEX sa...
UPDATE pgbench_branches SET bbalance = bbalance + :delta WHERE bid = :bid; INSERT INTO pgbench_history (tid, bid, aid, delta, mtime) VALUES (:tid, :bid, :aid, :delta, CURRENT_TIMESTAMP); END; logged table 1、初始化 ./pgsql11/bin/pgbench -i -s 5000 2、表大小 postgres=# \dt+...
(5,'David',27,'Texas',85000.00,'2007-12-13');# 查询select*fromcompany;SELECT(17+6)ASADDITION;SELECTCOUNT(*)AS"RECORDS"FROMCOMPANY;SELECTCURRENT_TIMESTAMP;# 子查询SELECTAGEFROMCOMPANYWHEREEXISTS(SELECTAGEFROMCOMPANYWHERESALARY>65000);# 更新UPDATECOMPANYSETSALARY=15000WHEREID=3;UPDATECOMPANYSET...
CREATE USER MAPPING FOR CURRENT_USER SERVER clickhouse_svr OPTIONS (user 'default', password '9dje3RtgO7eeHb'); -- 创建外部表 CREATE FOREIGN TABLE dwd_user_info ( user_infoid text, code text, name text, createdon timestamp ) SERVER clickhouse_svr; ...
CREATEORREPLACEFUNCTIONauditlogfunc()RETURNSTRIGGERAS$example_table$BEGININSERTINTOAUDIT(EMP_ID, ENTRY_DATE)VALUES(new.ID,current_timestamp);RETURNNEW;END; $example_table$ LANGUAGE plpgsql; 列出触发器: #SELECT*FROM pg_trigger; 列举出特定表的触发器,语法如下: ...
1、PGSQL自动递增序列的做法 首先,在声明该列时用SERIAL类型,然后用setval(‘序列发生器’,递增的初始值)函数设置列的初始值,其中‘序列发生器’可以在表建好后,在系统生成的有关该表的SQL脚本中找到。其次,在使用时只要调用nextval(‘序列发生器名称’)就可以了。2、数组构造器,用关键字ARRAY。行构造器,用...
update_time timestamp(6) without time zone DEFAULT CURRENT_TIMESTAMP,create_time timestamp(6) without time zone DEFAULT CURRENT_TIMESTAMP,bussiness_area character varying COLLATE pg_catalog."default",is_chain_brand smallint DEFAULT0,source smallint DEFAULT1,create_user character varying(255) COLLATE...
=#CREATETABLEjust_for_fun(last_updated timestamptz);=#INSERTINTOjust_for_fun(last_updated)VALUES(now());=#UPDATEjust_for_funSETlast_updated=now(); 1.2 执行pg_basebackup 代码语言:javascript 复制 =$ mkdir/var/tmp/backups;pg_basebackup-D/var/tmp/backups=$ ls-l/var/tmp/backups/total360...