$today = date("Y-m-d"); // 执行查询语句 $sql = "SELECT * FROM your_table_name WHERE DATE(date_column) = '$today'"; $result = $conn->query($sql); 1. 2. 3. 4. 5. 6. 3. 获取查询结果 // 输出查询结果 if ($result->num_rows > 0) { // 输出数据 while($row = $resul...
password='password',host='localhost',database='database_name')# 创建游标对象cursor=cnx.cursor()# 计算一个月前的日期today=datetime.date.today()one_month_ago=today-datetime.timedelta(days=30)# 构造查询语句query="SELECT * FROM table_name WHERE date_column BETWEEN %s AND %s"# 定义查询参数...
机器学习是人工智能领域的一个重要学科．自从20世纪80年代以来机器学习在算法理论和应用等方面都获得巨大成...
代码语言:txt 复制 SELECT * FROM your_table WHERE DATE_FORMAT(your_date_column, '%Y-%m-%d') = CURDATE(); 问题二:性能问题 原因:当数据量较大时,查询可能会变慢。 解决方法: 使用索引优化查询性能。 分页查询以减少每次查询的数据量。 代码语言:txt 复制 SELECT * FROM your_table WHERE DATE(your_...
where DATE_FORMAT(createtime,'%Y%m') = DATE_FORMAT(CURDATE(),'%Y%m') ;-- 查询距离当前现在6个月的数据-- select count(id) as count from user where createtime between date_sub(now(),interval 6 month) and now();-- 查询今天的数据-- SELECT count(id) as count FROM user WHERE date_...
$today = date("Y-m-d 00:00:00"); $result = $this->my_class->get_sql("select count(*) from obj_folder where create_time>'$yestoday' and create_time<='$today'"); 查询当前这周的数据 SELECT name,submittime FROM enterprise WHERE YEARWEEK(date_format(submittime,'%Y-%m-%d')) = YE...
DATE_ADD(birth_date,INTERVALyear_diff+1year)asnext,DATE_ADD(birth_date,INTERVALyear_diff-1year)aslast, todayfrom(-- 获取当前事前与出生日期的年度差 year_diffselectemp_no,first_name,last_name,birth_date,(year(NOW())-year(birth_date))asyear_diff,NOW()astodayfromemployees ) a ) b ) c...
select count(id) as count from user where date_format(createtime,'%Y-%m')=date_format(DATE_SUB(curdate(), INTERVAL 1 MONTH),'%Y-%m') -- 查询这个月的数据 -- SELECT count(id) as count FROM user WHERE date_format(createtime,'%Y-%m')=date_format(now(),'%Y-%m'); -- select ...
日期和时间函数 DATE DSC支持迁移Teradata中包含DATE FORMAT的SELECT语句,使用TO_CHAR并以源格式显示日期。如果日期格式是一个表达式(例如:Start_Dt + 30)或者WHERE子句包含表达式(例如:WHERE Start_Dt > End_Dt),则不会执行此转换。 来自:帮助中心 查看更多 → ...
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