Folks, I have a database with a billion rows in each of several tables that have composite keys. Given a particular row, I need to get the next few rows. If I had a simple key called, say, (id), I could do this: SELECT * FROM mytable WHERE id>currentid ORDER BY id LIMIT 10...
the heap location in Postgres or the primary key in MySQL. Either way, napkin math of a few hundred microseconds still seems fair! ↩ Looking at the real index sizes, the compound index is ~70 MiB in Postgres, and 350 MiB in MySQL. We’d expect the entire index of ~3 64 bit ...
Bug #83082 Update failing with composite primary key Submitted: 21 Sep 2016 14:49Modified: 22 Sep 2016 7:15 Reporter: Martin Humphries Email Updates: Status: Verified Impact on me: None Category: MySQL Server: DDLSeverity: S2 (Serious) Version: 5.7.13OS: Windows (7 Ultimate SP1) ...
Bug #30590 delete from memory table with composite btree primary key Submitted: 23 Aug 2007 10:26Modified: 22 Oct 2007 22:08 Reporter: Shane Bester (Platinum Quality Contributor) Email Updates: Status: Closed Impact on me: None Category: MySQL Server: Memory storage engineSeverity: S1 (...
@@FETCH_STATUS in nested loops @@ServerName returns wrong value in SQL SERVER 2008 ##TempTable and INSERT-SELECT FROM an existing Table with an IDENTITY column %rowtype equivalent in SQL server ++ operator in TSQL - bug or feature? 2 tables referencing each other using foreign key.is it ...
diff --git a/django/db/backends/mysql/compiler.py b/django/db/backends/mysql/compiler.py index 2ec6bea2f1..0291b76c70 100644 ab 11from django.core.exceptions import FieldError, FullResultSet 22from django.db.models.expressions import Col ...
@@FETCH_STATUS in nested loops @@ServerName returns wrong value in SQL SERVER 2008 ##TempTable and INSERT-SELECT FROM an existing Table with an IDENTITY column %rowtype equivalent in SQL server ++ operator in TSQL - bug or feature? 2 tables referencing each other using foreign key.is it ...
(); } } 第二种方式:直接通过一个类来描述...5.组合主键的第二种实现方式,直接通过一个类来描述类结构 /** * 在类中有组合主键那么必须实现Serializable接口 * */ public class Result implements...-- 复合主键的映射 --> composite-id> 映射 --> composite-id> <key-many-to-one name="student"...
classMembership<ActiveRecord::Baseself.primary_keys=:user_id,:group_idbelongs_to:userbelongs_to:grouphas_many:statuses,:class_name=>'MembershipStatus',:foreign_key=>[:user_id,:group_id]end Note the addition of the line: self.primary_keys=:user_id,:group_id ...
KeyPartOne int not null, KeyPartTwo varchar(64) not null, KeyPartThree int not null, Primary key (KeyPartOne, KeyPartTwo, KeyPartThree) )Engine=Memory; -- The Update Query (works fine with only 1 row in Temp table) update MyDataTable natural join MyTempTable set RelevantDat...