FROM information_schema.columns WHERE table_name = 'test2' ORDER BY ordinal_position; List INDICES Here's the query that will return the names of the INDICES defined in the TEST2 table. Unfortunately I have no idea how to extract them from the INFORMATION_SCHEMA. If you do, please let...
1. 查看当前库sehcma大小,并按schema大小排序 SELECTschema_name, pg_size_pretty(sum(table_size)::bigint)as"diskspace",round((sum(table_size)/pg_database_size(current_database()))*100,2)as"percent(%)"FROM(SELECTpg_catalog.pg_namespace.nspnameasschema_name, pg_total_relation_size(pg_cata...
从逻辑上看,schema,table,都是位于database之下。 首先,在postgres数据库下建立表(相当于建立在public schema下): [pgsql@localhost bin]$ ./psql-d postgres psql (9.1.2) Type "help"forhelp. postgres=#createtabletab200(idinteger);CREATETABLEpostgres=# \q 然后,再在tester数据库下建立表(相当于建立在...
do $$declarer record;beginforrin(selecttablenamefrompg_tableswhereschemaname='my-schema-name')loopexecute'drop table if exists'||quote_ident(r.tablename)||'cascade';endloop;end$$; This query works by listing out all the tables in the given schema and then executing adrop tablefor each (...
pg_restore: [archiver (db)] could not execute query: ERROR: could not open extension control file "/usr/local/pgsql/share/extension/pgstattuple.control": 没有那个文件或目录 Command was: CREATE EXTENSION IF NOT EXISTS pgstattuple WITH SCHEMA public; ...
EXPLAINSELECTschemaname,tablenameFROMpg_tablesWHEREtableowner='postgres'ORDERBYtablename;QUERYPLAN−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−...
DROP SCHEMA删除一个模式。DROP SCHEMA name [, ...] [ CASCADE | RESTRICT ]DROP SEQUENCE删除一个序列。DROP SEQUENCE name [, ...] [ CASCADE | RESTRICT ]DROP TABLE删除一个表。DROP TABLE name [, ...] [ CASCADE | RESTRICT ]DROP TABLESPACE删除一个表空间。
{APPEND|CREATE|INSERT|REPLACE} destination_table [(column, column, column, ...)] USING query sql>COPY FROM SCOTT/TIGER@HQ TO JOHN/CHROME@WEST create emp_temp USING SELECT * FROM EMP 30.不退出sql*plus,在sql*plus中执行一个操作系统命令: ...
tables WHERE table_schema = 'rdk'; 对rdk.mols表中的m列建立索引,命名为molidx create index molidx on rdk.mols using gist(m); 将rdk.mols表中的id列设为主键,主键必须唯一且非空 alter table rdk.mols add primary key (id); 三、结构搜索与查询 终于进入正题了,准备俩小时,查询五分钟。 1....