列出表 / 集合

Oracle

SELECT table_name FROM user_tables ORDER BY table_name;
-- All schemas: SELECT owner, table_name FROM dba_tables ORDER BY owner, table_name;

user_tables 返回当前 schema 中的表，all_tables 返回可访问的表。

PostgreSQL

SELECT table_schema, table_name
FROM information_schema.tables
WHERE table_type = 'BASE TABLE' AND table_schema NOT IN ('pg_catalog','information_schema')
ORDER BY 1, 2;
-- psql shortcut: \dt *.*

仅 public schema：WHERE table_schema = 'public'。

MySQL

SHOW TABLES;
-- Another schema: SHOW TABLES FROM mydb;

查看详情：SELECT table_name, table_rows FROM information_schema.tables WHERE table_schema = DATABASE();

SQL Server

SELECT s.name AS schema_name, t.name AS table_name
FROM sys.tables t
JOIN sys.schemas s ON t.schema_id = s.schema_id
ORDER BY s.name, t.name;

快捷方式：SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE';

MongoDB

show collections
// or: db.getCollectionNames()

如需同时查看系统集合：db.getCollectionInfos()。

Redis

SCAN 0 MATCH * COUNT 100
# Continue with SCAN <cursor> ... using the returned cursor

Redis 没有“表”；列出的是键。生产环境中切勿使用 KEYS *（会阻塞）；SCAN 基于游标。