SELECT pg_catalog.col_description( (SELECT oid FROM pg_catalog.pg_class WHERE relname = 'example_table')::regclass, 'example_column' ) AS column_comment; 在这个查询中: pg_catalog.col_description是一个函数,用于获取指定表和字段的注释。 (SELECT oid FROM pg_catalog.pg_class WHERE relname =...
SELECT pg_catalog.col_description(c.oid, sc.ordinal_position::INT) FROM pg_catalog.pg_class c WHERE c.oid = (SELECT ('"' || sc.table_name || '"')::REGCLASS::OID) AND c.relname = sc.table_name ) AS comment FROM information_schema.columns sc WHERE table_schema = 'public' AND ...
col_description ( A.attrelid, A.attnum ) AS COMMENT FROM pg_class AS C, pg_attribute AS A WHERE C.relname = 'table_name' AND A.attrelid = C.oid AND A.attnum > 0 二、函数创建步骤 (一)创建函数 CREATE OR REPLACE FUNCTION ods.find_table_by_column_and_schema() RETURNS "pg_catal...
NULLIF(information_schema._pg_char_max_length(A.atttypid, A.atttypmod), -1) AS maxlen, -- 字符串最大长度 col_description ( A.attrelid, A.attnum ) AS COMMENT, -- 字段备注 format_type ( A.atttypid, A.atttypmod ) AS TYPE, A.attnotnull AS NOTNULL , -- 是否非空 A.atthasd...
pcolumn.ordinal_position) as ColumnDescription, case when pkey.colname = pcolumn.column_name then true else false end as IsPrimaryKey, case when pcolumn.column_default like 'nextval%' then true else false end as IsIdentity, case when pcolumn.is_nullable = 'YES' ...
revoke select on all tables in schema pg_catalog from 用户名; 1. 撤回对数据库的操作权限: revoke all on database 数据库名 from 用户名; 1. 四、模式 Schema 创建和当前用户同名模式(schema): 注意:用户名与 schema 同名,且用户具有访问改 schema 的权限,用户连入数据库时,默认即为当前 schema。
revoke select on all tables in schema pg_catalog from 用户名; #撤回对数据库的操作权限 revoke all on database 数据库名 from 用户名; #删除用户 drop user 用户名; 更多关于大数据 PostgreSQL 系列的学习文章,请参阅:PostgreSQL 数据库,本系列持续更新中。
pg_catalog.pg_namespaceとpg_catalog.pg_attributeでテーブルのOIDを取得し、pg_catalog.pg_attributeからカラム名とカラム番号を取得します。 コメント情報関数のpg_catalog.col_description()関数でカラムのコメントを取得することが出来ます。 col_description()関数は、テーブルのOIDとその列番号で指定さ...
varchar2 FROM information_schema.tables tb JOIN pg_class c ON c.relname = tb.table_name LEFT JOIN pg_description d ON d.objoid = c.oid AND d.objsubid = '0' where table_name like '%' || tableName || '%' and table_schema not in('pg_catalog','information_schema','dbe_pldevel...
col.ordinal_position; --查询没有主键的表 SELECT * FROM ( SELECT pc.relname , pc2.conname , pc2.contype FROM pg_catalog.pg_class pc INNER JOIN information_schema.tables t ON t.table_name = pc.relname LEFT JOIN pg_catalog.pg_constraint pc2 ON ...