;ModuleID='sum.c'source_filename="sum.c"targetdatalayout="e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"targettriple="x86_64-pc-linux-gnu";FunctionAttrs:noinlinenounwindoptnoneuwtabledefinedso_locali32@sum(i32%0,i32%1)#0{%3=allocai32,align4%4=al...
postgres=# drop table t_ret; DROP TABLE postgres=# create table t_ret(id int, info text, crt_time timestamp); CREATE TABLE postgres=# insert into t_ret values (1,’digoal’,now()), (2,’DIGOAL’,now()), (3,’digoal’,now()), (4,’abc’,now()); INSERT 0 4 postgres=# c...
CREATTABLEexample(ainteger,binteger,cinteger,UNIQUE(a,c)); How to add or deleteconstraintson a table: ALTERTABLEtable_nameADDCONSTRAINTconstraint_nameconstraint_definition;ALTERTABLEtable_nameDROPCONSTRAINTIFEXISTconstraint_name;ALTERTABLEtable_nameALTERCOLUMNcolumn_nameDROPNOTNULL; Example ALTER TABLE exam...
"select tablename from pg_tables where schemaname='public'" —— 得到所有用户自定义表的名字(这里"tablename"字段是表的名字,"schemaname"是schema的名字。用户自定义的表,如果未经特殊处理,默认都是放在名为public的schema下) General \copyright show PostgreSQL usage and distribution terms \g [FILE] or ...
file) with external editor \ef [FUNCNAME [LINE]] edit function definition with external editor...Informational (options: S = show system objects, + = additional detail) \d[S+] list tables, views, and sequences \d[S+] NAME describe table, view, sequence, or index \da...
CREATETABLEfoo (fooidint, foosubidint, fooname text);CREATEFUNCTIONgetfoo(int)RETURNSSETOF fooAS$$SELECT*FROMfooWHEREfooid=$1; $$LANGUAGESQL;SELECT*FROMgetfoo(1)ASt1;SELECT*FROMfooWHEREfoosubidIN(SELECTfoosubidFROMgetfoo(foo.fooid) zWHEREz.fooid=foo.fooid ...
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 ...
SETmax_parallel_workers=DEFAULT;SETdefault_table_access_method=DEFAULT; 五、常用函数 create_immv 使用create_immv函数去创建IMMV。 create_immv(immv_nametext,view_definitiontext)RETURNSbigint create_immv定义一个新的IMMV。一个名为immv_name的表被创建,并且被view_definition指定的查询被执行并使用结果填...
非关系型数据库,又被称之为NoSQL,描述的是大量结构化数据存储方法的集合。可分为: 面向检索的列式存储,典型代表GoogleAppengine的BigTable; 面向高性能并发读/写的缓存存储,其结构类似于数据结构中的Hash表,MemcacheDB、BerkeleyDB、Redis、Flare就是Key-Value数据库的代表; ...
在表中增添一列:ALTER TABLE 表名 ADD 列名 数据类型; 往表中插入数据:insert into 表名(key1,key2,……) values (value1,value2,……); 如果向表中的所有字段插入值,则可以不需要指定字段(key1,key2,……) 插入多行: 查看表内容:select * from 表名; ...