在PostgreSQL中，可以创建一个“GIN”（通用倒排索引）索引来索引JSONB对象中的所有属性，或者可以使用“表达式”索引来在特定JSONB元素上创建索引。CREATE INDEX ccjsonb_path_ops_idx ON cc_jsonb USING GIN (data jsonb_path_ops);SELECT * FROM cc_jsonb WHERE data @> '{"name":"First"}'::jsonbSEL...
CREATEORREPLACEFUNCTIONexpire_rows_func (retention_hoursinteger)RETURNSvoidAS$$BEGINDELETEFROMcacheWHEREinserted_at <NOW() - (retention_hours ||' hours')::interval;END;$$ LANGUAGE plpgsql;CREATEORREPLACEFUNCTIONexpire_rows_func_trigger()RETURNStriggerAS$$BEGINPERFORM expire_rows_func (1);RETURN NEW...
Can a web service return an HTML formatted file? Can I comment on web.config? Can I convert Windows Form to Web Form? can i do div display:none; from c# code behind? can I get all public variables in a class? can I get value from Web.config and use the value as a parameter?
These are handled differently from Oracle, though, so changes still need to be made. Here are some tips for optimizing error handling for Postgres: Transaction control inside of PL/pgSQL is not permitted: you cannot commit or roll back a transaction inside a stored procedur...
{user_id:'1'},User);// Get a user that may not exist. Returns `null` if the user cannot be found.constmaybeUser=awaitqueryOptionalRow(sql.select_user,{user_id:'1'},User);// Call a stored procedure. Return value is equivalent to the functions above.constusers=awaitcallRows('select...
Once that is done, tests can be written as functions under the “unit_tests” schema that do not accept any arguments and return the data type “test_result.” For example, if you have a table with two columns—id and value—and a stored procedure that adds one to each value in the...
During a switchover, the shutdown procedure is slightly different from the general case. Indeed, the operator requires the former primary to issue afastshut down before the selected new primary can be promoted, in order to ensure that all the data are available on the new primary. ...
Could not find stored procedure 'sp_start_job' Could not generate configuration file error Could not get provider invariant name from the connection type qualifier "MySql.Data.MySqlClient.MySqlConnection" Could not load file or assembly 'Microsoft.Datawarehouse.AS' or one of its dependencies Could...
To exit from ‘psql’, use the following command: \q To return to Azure CLI 2.x interface, run the 'exit' command twice. External connection to VM TCP-port 5433 has to be opened for external connection to Postgres Pro database:
select username,account_status from dba_users; --显示所有用户信息 select * from dba_users; --将SCOTT帐号解锁(加锁) alter user scott account unlock(lock); --当前用户的缺省表空间 select default_tablespace from dba_users where username=(select user from dual); ...