concat_ws('',t.typname,SUBSTRING(format_type(a.atttypid,a.atttypmod) from '(.*)')) as "字段类型" FROM pg_class as c, pg_attribute as a, pg_type as t WHERE c.relname = 't_batch_task' and a.atttypid = t.oid and a.attrelid = c.oid and a.attnum>0; 索引管理 创建索引...
d.description as 列名描述, concat_ws('', t.typname, SUBSTRING(format_type(a.atttypid, a.atttypmod) from '\(.*\)')) as "属性", (case when a.attnotnull = true then 1 else 0 end) as 是否非空, (case when ( select count(pg_constraint.*) from pg_constraint inner join pg_clas...
查询表中所有字段、主键、唯一、外键、是否为空 select 'true' as list,'true' as edit,'false' as search,a.attname as column_name,format_type(a.atttypid,a.atttypmod) as data_type, (case when atttypmod-4>0 then atttypmod-4 else 0 end)data_length, (case when (select count(*) from...
We recently announced the 𝗽𝗿𝗲𝘃𝗶𝗲𝘄 𝗼𝗳 𝗣𝗼𝘀𝘁𝗴𝗿𝗲𝗦𝗤𝗟 𝟭𝟳 onAzure Database for PostgreSQL- 𝗙𝗹𝗲𝘅𝗶𝗯𝗹𝗲 𝗦𝗲𝗿𝘃𝗲𝗿! :party_popper: This release brings exciting new features like improved que...
format_type(type_oid,typemod) text 获取一个数据类型的SQL名称 pg_get_viewdef(view_oid) text 为视图获取CREATE VIEW命令 pg_get_viewdef(view_oid,pretty_bool) text 为视图获取CREATE VIEW命令 pg_get_ruledef(rule_oid) text 为规则获取CREATE RULE命令 pg_get_ruledef(rule_oid,pretty_...
format_type(a.atttypid,a.atttypmod) as 类型, (case when atttypmod-4>0 then atttypmod-4 else 0 end) as 长度, (case when (select count(*) from pg_constraint where conrelid = a.attrelid and conkey[1]=attnum and contype='p')>0 then 'PRI' ...
(format!("({})", type_modifier)).expect("no NUL in the middle") } // create the actual type, specifying the input and output functions extension_sql!( r#" CREATE TYPE vector ( INPUT = vector_input, OUTPUT = vector_output, TYPMOD_IN = vector_modifier_input, TYPMOD_OUT = vector_...
用于创建新类型的 SQL 语句是CREATE TYPE ...,从它的文档,我们会知道我们正在实现的vector类型是一个基类型,要创建基类型,需要支持函数input_function和output_function。而且由于它需要采用使用modifer实现的维度参数(vector(DIMENSION)),因此还需要函数type_modifier_input_function和type_modifier_output_function。因此...
psql (16.3 (Debian 16.3-1.pgdg120+1)) Type "help" for help. postgres=# 现在我们来创建新数据库并加载数据: create database blogdb; \c blogdb; create table countries ( id integer primary key generated always as identity, name text not null unique, alpha_2 char(2) not null, alpha_3 ...
是一种用于标识数据库对象的数据类型。OID代表对象标识符(Object Identifier),它是一个唯一的标识符,用于在数据库中唯一地标识各种对象,如表、索引、函数等。 OID类型在postgres函数中的应用场景包括: 数据库内部使用:OID类型可以用于内部标识数据库对象,例如在系统表中存储对象的元数据信息。