pgsql查询表中字段名,类型,备注以及是否非空 SELECT col_description ( A.attrelid, A.attnum ) AS COMMENT, format_type ( A.atttypid, A.atttypmod ) AS TYPE, A.attname AS NAME, A.attnotnull AS NOTNULL FROM pg_class AS C, pg_attribute AS A WHERE C.relname='dm_ass_gp_income'AND ...
使用\d 表名 命令来查看指定表的字段类型。例如,如果你有一个表名为 my_table,你可以运行: shell \d my_table 方法二:使用 SQL 查询 如果你更喜欢使用 SQL 查询来获取表字段类型信息,可以使用以下 SQL 语句: sql SELECT a.attname AS column_name, format_type(a.atttypid, a.atttypmod) AS data_...
,format_type(a.atttypid, a.atttypmod) attr_type ,co.contype from pg_namespace n join pg_tables t on t.schemaname = n.nspname join pg_class c on c.relname = t.tablename and c.relnamespace = n.oid join pg_attribute a on a.attrelid = c.oid left join pg_constraint co on ...
format_type("a".atttypid,"a".atttypmod) as data_type, col_description("a".attrelid,"a".attnum) as comment from pg_attribute "a" where attstattarget=-1 and attrelid in (select oid from pg_class where relname in(select relname from pg_class)) order by table_name,"a".attnum; ...
select c.relname, col_description(a.attrelid, a.attnum) as comment, format_type(a.atttypid, a.atttypmod) as type, a.attname as name, a.attnotnull as notnull from pg_class as c, pg_attribute as a where a.attrelid = c.oid and a.attnum > 0 and c.relname = 'student'; ...
COPY { table_name [ ( column_name [, ...] ) ] | ( query ) } TO { 'filename' | PROGRAM 'command' | STDOUT } [ [ WITH ] ( option [, ...] ) ] 其中option 可以是下列之一: FORMAT format_name OIDS [ boolean ] FREEZE [ boolean ] ...
%TYPE表示一个变量或表字段的数据类型，PL/pgSQL允许通过该方式声明一个变量，其类型等同于variable或表字段的数据类型，见如下示例：user_id users.user_id%TYPE;在上面的例子中，变量user_id的数据类型等同于users表中user_id字段的类型。通过使用%TYPE，一旦引用的变量类型今后发生改变，我们也无需修改该变量的...
Type "help" for help. bash-4.2$ exit exit [root@localhost xander]# 如果要实现外部访问,我们需要修改pg_hba.conf的文件以及postgresql.conf文件,但是由于本部分使用RPM的安装方式,很多配置都是官方预设的,常常会找不到这两个文件...所以在介绍如何实现远程访问之前,这里补充 Postgresql 使用RPM安装的配置说明。
(unix_timestamp,format)`, MySQL 日期时间计算函数(加上或者减去一段时间) MySQL 为日期增加一个时间间隔:`date_add()` MySQL 为日期减去一个时间间隔...MySQL 时区(timezone)转换函数 convert_tz(dt,from_tz,to_tz) mysql获得当前日期时间获得当前日期+时间(date + time)函数:now() mysql...DATE_SUB(...
1. 2. 3. 查看特定表名备注 select relname as tabname, cast(obj_description(relfilenode,'pg_class') as varchar) as comment from pg_class c where relname ='表名'; 1. 2. 3. 查看特定表名字段 select a.attnum,a.attname,concat_ws('',t.typname,SUBSTRING(format_type(a.atttypid,a.att...