CREATE TABLE 新表 LIKE 旧表 复制旧表的数据到新表(假设两个表结构一样) INSERT INTO 新表 SELECT * FROM 旧表 1. 复制旧表的数据到新表(假设两个表结构不一样) INSERT INTO 新表(字段1,字段2,...) SELECT 字段1,字段2,... FROM 旧表 如果是 SQL SERVER 2008 复制表结构,使用如下方法: 1. 2...
postgres=# create or replace view vi as select * from dummy_table where age is NULL; CREATE VIEW 11. 使用select语句创建表 postgres=# select 'My name is X' as col1 , 10 as col2, 'Address is -XYZ location' as col3 into new_table; SELECT 1 postgres=# select * from new_table ...
In Postgres, theCREATE TABLE ASstatement allows us to create a table from an existing one. It creates the table based on the result-set retrieved by the SELECT query. Follow the below syntax to avail the functionality of the Postgres’CREATE TABLE ASstatement: CREATE TABLE new_tab AS SELECT...
heap_create_with_catalog:表创建函数 11.heap_create:表创建 12.table_relation_set_new_filenode:创建表的函数指针 13.heapam_relation_set_new_filenode:实际的执行标创建的函数 14.RelationCreateStorage:构建磁盘的表文件 // 如果是根据tablespace oid,database oid,table oid创建一个数据库表 15.smgrcreate-...
例如,我们查看下 select 语句的语法: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 ] [...
createTime date, primary key(Id) ) 1. 2. 3. 4. 5. 6. 7. 8. 二、创建序列 create sequence seq_test 三、创建触发器 create or replace trigger autoId before insert on testTable for each Row when (NEW.ID is null) begin select seq_test.nextval into :new.ID from dual; ...
– 前面的例子已经知道, for each statement的返回值对行的值以及for each row的触发器没有影响. 所以下面的例子都是针对for each row的. INSERT before for each row 触发器函数 接收 NEW, 修改这个record对结果的影响是什么? – 创建测试表 postgres=# drop table t_ret ; DROP TABLE postgres=# create ...
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 ...
CREATE USER 'ggadmin' IDENTIFIED BY '<ggadmin-password>'; GRANT SELECT, REPLICATION SLAVE, REPLICATION CLIENT, CREATE,CREATE VIEW, EVENT, INSERT, UPDATE, DROP,EXECUTE, DELETE ON *.* TO 'ggadmin'; サンプル・スキーマを使用してターゲット表を作成します。
postgres=#create table t_range (f1 bigint,f2 timestamp default now(), f3 integer) partition by range (f3) begin (1) step (50) partitions (3) distribute by shard(f1); CREATE TABLE postgres=# insert into t_range(f1,f3) values(1,1),(2,50),(3,100),(2,110); ...