测试数据库接口是否正常时发生报错: SAWarning: Column'post.id'is marked as a member of the primary keyfortable'post', but has no Python-side or server-side default generator indicated, nor does it indicate'autoincrement=True'or'nullable=True', and no explicit value is passed. Primary key col...
alter table server drop constraint server_pkey ;alter table server add primary key (id) ; 主键添加完成之后可以通过\d查看。 zhangnq=# \d server Table "public.server" Column | Type | Modifiers ---+---+--- id | integer | not null default nextval('server_int_seq'::regclass) ip | cha...
今天在PostgreSQL遇到一个奇怪的现象,简而言之,是想用函数(存储过程)实现插入记录,整个过程没报错但事后却没找到记录!忙活半天,才发现原因是PostgreSQL函数(存储过程)有自动COMMIT或ROLLBACK的特殊规定。 二、问题重现 以下用示例表和示例代码来重现该问题。 createtablet1 ( IDintnotnullprimarykey, namevarchar(20) ...
A partitioned table is divided into sub-tables (called partitions), which are created using separate CREATE TABLE commands. The partitioned table is itself empty. A data row inserted into the table is routed to a partition based on the value of columns or expressions in the partition key. I...
CREATE TABLE tbl_Students ( StudID INTEGER PRIMARY KEY ,StudName CHARACTER VARYING ,StudClass CHAR(1) ); Insert few sample records in Student Master table: 1 2 3 4 INSERT INTO tbl_Students VALUES (1,'Anvesh','A') ,(2,'Neevan','B'),(3,'Jenny','C') ...
普通表(Regular Table):这是最常用的表类型,用于存储数据。 临时表(Temporary Table):这些表只在当前会话中存在,并在会话结束后自动删除。临时表通常用于存储中间结果或临时数据。 视图(View):视图是一种虚拟的表,它是通过查询已存在的表或其他视图来创建的。视图提供了一种简化数据访问的方式,并可以用作数据的过...
CREATE TABLE users ( id int PRIMARY KEY, name text ); SELECT ddlx_script('users'); CREATE TYPE my_enum AS ENUM ('foo','bar'); SELECT ddlx_script('my_enum'); SELECT ddlx_script(current_role::regrole); A number of other functions are provided to extract more specific objects. Their...
table_size bigint, + autovacuum_frequency interval, + capture_time timestamp without time zone DEFAULT CURRENT_TIMESTAMP, + PRIMARY KEY (id) + ); (1 row) 注意: 1、这个function是database级别的,如果换到其它database 需要重建创建function。
CREATETABLEbasic (idINTEGERNOTNULLPRIMARYKEY, aTEXT); 创建一个将连接到你之前创建的发布的订阅。 SQL CREATESUBSCRIPTION subCONNECTION'host=<server>.postgres.database.azure.com user=<rep_user> dbname=<dbname> password=<password>'PUBLICATION pub; ...
] ) [ INHERITS ( parent_table [, ... ] ) ] [ WITH OIDS | WITHOUT OIDS ] [ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ] [ TABLESPACE tablespace ]column_constraint 可以是以下选项之一:[ CONSTRAINT constraint_name ] { NOT NULL | NULL | UNIQUE [ USING INDEX TABLESPACE tablespac...