SQLite MAX()函數

SQLite MAX()函數用於獲取運算式或給定列的最大值。

語法

SELECT MAX(aggregate_expression)
FROM tables
[WHERE conditions];

在GROUP BY子句中使用Max()函數時的語法：

SELECT expression1, expression2, ... expression_n
MAX(aggregate_expression)
FROM tables
[WHERE conditions]
GROUP BY expression1, expression2, ... expression_n;

示例1：

假設有一個名為student的表，具有以下數據：

從student表中檢索學生的最高費用(fees)：

SELECT MAX(FEES) AS "Highest Fees"  FROM STUDENT;

-- 最大年齡

SELECT MAX(age) AS "Highest age"  FROM STUDENT;

執行上面查詢代碼，得到以下結果 -

sqlite> SELECT MAX(FEES) AS "Highest Fees"  FROM STUDENT;
65000.0
sqlite>
sqlite> -- 最大年齡

sqlite> SELECT MAX(age) AS "Highest age"  FROM STUDENT;
27
sqlite>

示例2：

使用具有的GROUP BY子句的MAX()函數：

從student表中檢索NAME,ADDRESS和MAX(FEES)，並按ADDRESS的數據排序：

SELECT NAME, ADDRESS, MAX(FEES) AS "Highest FEES"
FROM STUDENT
WHERE ID <= 8
GROUP BY ADDRESS;

執行上面代碼，得到以下結果 -

sqlite> SELECT NAME, ADDRESS, MAX(FEES) AS "Highest FEES"
   ...> FROM STUDENT
   ...> WHERE ID <= 8
   ...> GROUP BY ADDRESS;
Minsu|Beijing|15000.0
Linsu|Guangzhou|65000.0
Sqlsu|Haikou|25000.0
Avgsu|Shanghai|2000.0
Maxsu|Shengzhen|20000.0
sqlite>