CREATE OR REPLACE FUNCTION "public"."f_inittables1"(arr _text)RETURNS "pg_catalog"."void" AS $BODY$DECLAREscount INTEGER;rownum integer := 1;currsnum text;strSQL text;BEGINscount:=array_length(arr,1);while rownum <= scount LOOPcurrsnum:=arr[rownum];RAISE NOTICE '这里是%', currsnum...
spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-115516077-blog-52493197.235%5Ev43%5Econtrol&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-115516077-blog-52493197.235%5Ev43%5Econtrol&utm_relevant_...
直观起见我们依旧通过举例说明,下面通过CREATE TABLE LIKE来完成复制:create table t_key_event_file_student_101 (like t_key_event_file_student); 复制成功后再看一下表结构的DDL语句和数据: 如上图,同CREATE TABLE AS不同的是这次复制成功拷贝了所有NOT-NULL约束,并且没有拷贝表数据,这也渐渐...
如上图,这样一比较发现差距还挺大的,CREATE TABLE AS复制出来的表,所有约束、注释和序列都没有被拷贝,但数据成功拷贝了,就如同官方文档中的描述,显而易见,这与我们的预期相差甚远,所以就不做过多考虑了,接下来看看第二种复制方式——CREATE TABLE LIKE。 CREATE TABLE LIKE 如题,LIKE不同于CREATE TABLE AS ...
LIKE ...语句的基本语法结构(PostgreSQL模拟实现) 虽然PostgreSQL没有直接的CREATE TABLE ... LIKE ...语法,但我们可以使用pg_dump、psql命令或查询系统表来生成等效的CREATE TABLE语句,然后手动执行。为了简化,这里介绍一种使用查询系统表的方法来模拟: sql CREATE TABLE new_table_name AS SELECT * FROM existing...
CREATE TABLE LIKE 语句 CREATE TABLE AS TABLE 语句 SELECT INTO 语句 CREATE TABLE INHERITS 语句 PostgreSQL 提供了多种不同的复制表的方法,它们的差异在于是否需要复制表结构或者数据。 CREATE TABLE AS SELECT 语句 CREATE TABLE AS SELECT 语句可以用于复制表结构和数据,但是不会复制索引。 我们可以使用以下...
CREATE TABLE -- 定义一个新表 语法 CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name ( [ { column_name data_type [ DEFAULT default_expr ] [ column_constraint [ ... ] ] | table_constraint | LIKE parent_table [ { INCLUDING | EXCLUDING } { DEFAULTS | CONSTRAINTS...
CREATE TABLE定义一个新表。CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name ( { column_name data_type [ DEFAULT default_expr ] [ column_constraint [ ... ] ] | table_constraint | LIKE parent_table [ { INCLUDING | EXCLUDING } DEFAULTS ] } [, ... ] ) [ ...
Summary: in this tutorial, you will learn how to use the PostgreSQL CREATE TABLE statement to create a new table. Introduction to PostgreSQL CREATE TABLE statement Typically, a relational database consists of multiple related tables. Tables allow you to store structured data like customers, products...
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: ...