映射Usercreatetabletb_user(idserial,info info_type);-- 添加数据insertintotb_user(info)values(('张三',23));insertintotb_user(info)values(('露丝',233));insertintotb_user(info)values(('jack',33));insertintotb_user(info)values(('李四',24));select*fromtb_user;...
1 POSTGRESQL: Create table as Selecting specific type of columns 45 Postgres - CREATE TABLE FROM SELECT 1 Create a table from another table 0 Creating a table without creating a table 0 How to create table from a select query? 1 Create table from another table 0 PostgreSQL, CREATE ...
queryString=0x234add0 "CREATE TABLE films ( code char(5), title varchar(40), did integer, date_prod date, kind varchar(10), len interval hour t o minute);", context=PROCESS_UTILITY_TOPLEVEL, params=0x0, queryEnv=0x0, dest=0x2408658, completionTag=0x7ffcf8fb0e60 "") at utility.c...
CREATE TABLE films ( code char(5), title varchar(40), did integer, date_prod date, kind varchar(10), len interval hour to minute);建表语句执行parse_analyze函数时进入传统的transform阶段时并没有执行任何trasform功能的函数,而是直接走transformStmt函数的default分支:创建Query节点,让原...
Postgresql SELECT FROM TABLE with var PostgreSQL是一种开源的关系型数据库管理系统(RDBMS),它支持高级SQL查询语言和广泛的功能。在PostgreSQL中,使用SELECT语句从表中检索数据是非常常见的操作。 在执行SELECT查询时,可以使用变量(var)来指定查询条件或者在查询结果中使用。变量可以是任何合法的数据类型,如整数、字符串...
SELECT tablename FROM pg_tables; WHERE tablename NOT LIKE 'pg%' AND tablename NOT LIKE 'sql_%' ORDER BY tablename; 列出数据库名 \l 或 SELECT datname FROM pg_database; 切换数据库 \c 数据库名 1、通过命令行查询 \d 数据库 —— 得到所有表的名字 ...
Currently for a set of 110k entries in the products table and ~ 1.8 million ids returned by the union all selection, the whole query will take about 8 seconds to return. If I can get it below 1 second it would be super. SELECT * FROM products p WHERE p.id IN (...
To evaluate an expression or SELECT query but discard the result, use: PERFORM query;PERFORMfunctionxxx(); PERFORM *fromtablexxx; 4.3 Executing a Query with a Single-row Result The result of a SQL command yielding a single row (possibly of multiple columns) can be assigned to a record vari...
31 % postgres: postgres postgres 127.0.0.1(50234) SELECT 2 高并发大事务压测 创建1024个表,大批量INSERT。 连接到主节点执行如下: 1、建表 do language plpgsql $$ declare begin execute 'drop table if exists test'; execute 'create table test(id int8, info text, crt_time timestamp)'; for ...
CREATE OR REPLACE RULE db_table_ignore_duplicate_inserts AS ON INSERT TO db_table WHERE (EXISTS ( SELECT 1 FROM db_table WHERE db_table.tbl_column = NEW.tbl_column)) DO INSTEAD NOTHING; 1. 2. 3. 4. 5. 此外,根据Postgresql 插入或者更新操作upsert一文中提到的,在Postgresql9.5之后,提供了...