我有两个表: 事件 CREATE TABLE IF NOT EXISTS `event` (
`eventId` bigint(20) NOT NULL AUTO_INCREMENT,
`eventTime` bigint(20) NOT NULL COMMENT 'ex: 1431201865000 (epoch is milliseconds)',
`s
我不是很喜欢数据库,我发现一些问题试图修改在MySql上定义的查询。 我有这个疑问这是我的出发Poing的(有需要修改的查询): SELECT
MC_PS.id AS price_series_id,
MC_PS.market_commodity_details_id AS market_commodity_details_id,
MC_P
从以下查询中,哪一个是最优化和最快使用的? [COUNT(id)] $SQL = "SELECT name, COUNT(id) as Count FROM names WHERE name = :name";
$row = $stmt->fetch();
if ($data['count'] > 0) {
while ($row) {
$name = $row['nam