Question

我有这个MySQL查询，语法是正确的，但是当我想看到视图时，mysql进程会转到100％。

CREATE OR REPLACE VIEW tx_oriconvenios_consultas AS
        SELECT conv.*, tipo.descripcion AS tipo_convenio, uni.nombre AS n_universidad, ciu.nombre AS n_ciudad, pais.cn_short_es AS n_pais, COUNT(hist.estado) AS n_estado
        FROM tx_unalori_convenio AS conv
        LEFT JOIN tx_unalori_historico as hist
        ON conv.uid = hist.convenio
        INNER JOIN tx_unalori_tipoconv as tipo
        ON conv.tipoconv = tipo.uid
        INNER JOIN tx_unalori_universidad as uni
        ON conv.universidad = uni.uid
        INNER JOIN tx_unalori_ciudad as ciu
        ON ciu.uid=uni.uid_ciudad
        INNER JOIN static_countries as pais
        ON pais.cn_iso_3 = ciu.pais
        GROUP BY conv.uid

如果我删除：

INNER JOIN static_countries as pais
        ON pais.cn_iso_3 = ciu.pais

或：

 LEFT JOIN tx_unalori_historico as hist
    ON conv.uid = hist.convenio

然后我可以进入视图并查看寄存器。

我无法理解为什么。

我真的赞成一些解释。

对于那些问过的人，这是static_countries的结构：

CREATE TABLE IF NOT EXISTS `static_countries` (
  `uid` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `pid` int(11) unsigned DEFAULT '0',
  `deleted` tinyint(4) NOT NULL DEFAULT '0',
  `cn_iso_2` char(2) DEFAULT '',
  `cn_iso_3` char(3) DEFAULT '',
  `cn_iso_nr` int(11) unsigned DEFAULT '0',
  `cn_parent_tr_iso_nr` int(11) unsigned DEFAULT '0',
  `cn_official_name_local` varchar(128) DEFAULT '',
  `cn_official_name_en` varchar(128) DEFAULT '',
  `cn_capital` varchar(45) DEFAULT '',
  `cn_tldomain` char(2) DEFAULT '',
  `cn_currency_iso_3` char(3) DEFAULT '',
  `cn_currency_iso_nr` int(10) unsigned DEFAULT '0',
  `cn_phone` int(10) unsigned DEFAULT '0',
  `cn_eu_member` tinyint(3) unsigned DEFAULT '0',
  `cn_address_format` tinyint(3) unsigned DEFAULT '0',
  `cn_zone_flag` tinyint(4) DEFAULT '0',
  `cn_short_local` varchar(70) DEFAULT '',
  `cn_short_en` varchar(50) DEFAULT '',
  `cn_uno_member` tinyint(3) unsigned DEFAULT '0',
  `cn_short_es` varchar(50) NOT NULL DEFAULT '',
  PRIMARY KEY (`uid`),
  UNIQUE KEY `uid` (`uid`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=250 ;

这是tx_unalori_historico：

CREATE TABLE IF NOT EXISTS `tx_unalori_historico` (
  `uid` int(11) NOT NULL AUTO_INCREMENT,
  `pid` int(11) NOT NULL DEFAULT '0',
  `tstamp` int(11) NOT NULL DEFAULT '0',
  `crdate` int(11) NOT NULL DEFAULT '0',
  `cruser_id` int(11) NOT NULL DEFAULT '0',
  `deleted` tinyint(4) NOT NULL DEFAULT '0',
  `hidden` tinyint(4) NOT NULL DEFAULT '0',
  `be_users` int(11) NOT NULL DEFAULT '0',
  `convenio` int(11) NOT NULL DEFAULT '0',
  `estado` int(11) NOT NULL DEFAULT '0',
  `observaciones` text NOT NULL,
  PRIMARY KEY (`uid`),
  KEY `parent` (`pid`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3810 ;

Answer 1

谢谢@ypercube。

解决问题的方法是将索引键添加到static_countries.cn_iso_3和tx_unalori_ciudad.pais

MySQL Query进入循环

1 个答案: