这里插入了三行数据,每行数据包含两个整数值。 最后,您可以使用GREATEST函数来找到两个字段中的最大值,并给这个最大值起一个别名max_value: SELECTGREATEST(field1,field2)ASmax_valueFROMtable_name; 1. 这条SQL语句会返回一个包含最大值的结果集,别名为max_value。 序列图示例 请求教学如何在Mysql中寻找最大...
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SUM(amount)OVER(ORDERBYsale_dateROWSBETWEEN2PRECEDINGANDCURRENTROW)ASrolling_totalFROMsales;--使用RANGE指定窗口范围,计算当前行值附近范围内的平均值SELECTprice,AVG(price)OVER(ORDERBYpriceRANGEBETWEEN10PRECEDINGAND10FOLLOWING)ASavg_nearby_priceFROMproducts;...
SELECT YEAR(transaction_date) AS sales_year, (SUM(sales_value) - (SELECT SUM(sales_value) FROM sales_transactions WHERE YEAR(transaction_date) = sales_year - 1)) / (SELECT SUM(sales_value) FROM sales_transactions WHERE YEAR(transaction_date) = sales_year - 1) AS sales_growth_rate FROM...
首先,我们可以使用GROUP BY语句对学生姓名进行分组,然后使用MAX()函数找出每个分组中成绩的最大值。最后,我们可以使用JOIN语句将结果与原表进行连接,以获取完整的学生信息。 下面是一个简单的示例代码: SELECTs1.student_name,s1.scoreFROMscores s1JOIN(SELECTstudent_name,MAX(score)ASmax_scoreFROMscoresGROUPBYstude...
FOR EACH ROW BEGIN DECLARE 序号 INT; SELECT MAX(序号) INTO 序号 FROM 学生表; SET NEW.序号 = 序号 + 1; END; 全选代码 复制 这将在每次插入新记录时自动触发触发器,并将序号值加1赋给新记录的序号列。 通过以上六个方面的,我们可以看到,在MySQL中取得值并不难。无论是使用MAX函数、ORDER BY子句、...
Following is the c# code written to fetch the max value sql = "Select max(extension) as extension from reader;"; OleDbCommand myCommand = new OleDbCommand(sql, getDataConnection()); ; extension = (int)myCommand.ExecuteScalar(); when I execute the above in mysql prompt , I am getting the...
mysql>selectversion();+---+|version()|+---+|5.7.23-log|+---+1rowinset(0.00sec)mysql>show variables like'innodb_fast_shutdown';+---+---+|Variable_name|Value|+---+---+|innodb_fast_shutdown|1|+---+---+1rowinset(0.00sec)# 确保数据都刷到硬盘上,更改成0mysql>setglobal innodb...