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MySQL 教程

MySQL 主页 MySQL 简介 MySQL RDBMS

MySQL SQL

MySQL SQL MySQL SELECT MySQL WHERE MySQL AND, OR, NOT MySQL ORDER BY MySQL INSERT INTO MySQL NULL 值 MySQL UPDATE MySQL DELETE MySQL LIMIT MySQL MIN 和 MAX MySQL COUNT, AVG, SUM MySQL LIKE MySQL 通配符 MySQL IN MySQL BETWEEN MySQL 别名 MySQL 连接 MySQL INNER JOIN MySQL LEFT JOIN MySQL RIGHT JOIN MySQL CROSS JOIN MySQL 自连接 MySQL UNION MySQL GROUP BY MySQL HAVING MySQL EXISTS MySQL ANY, ALL MySQL INSERT SELECT MySQL CASE MySQL 空值函数 MySQL 注释 MySQL 运算符

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MySQL 参考

MySQL 数据类型 MySQL 函数
字符串函数 ASCII CHAR_LENGTH CHARACTER_LENGTH CONCAT CONCAT_WS FIELD FIND_IN_SET FORMAT INSERT INSTR LCASE LEFT LENGTH LOCATE LOWER LPAD LTRIM MID POSITION REPEAT REPLACE REVERSE RIGHT RPAD RTRIM SPACE STRCMP SUBSTR SUBSTRING SUBSTRING_INDEX TRIM UCASE UPPER 数值函数 ABS ACOS ASIN ATAN ATAN2 AVG CEIL CEILING COS COT COUNT DEGREES DIV EXP FLOOR GREATEST LEAST LN LOG LOG10 LOG2 MAX MIN MOD PI POW POWER RADIANS RAND ROUND SIGN SIN SQRT SUM TAN TRUNCATE 日期函数 ADDDATE ADDTIME CURDATE CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP CURTIME DATE DATEDIFF DATE_ADD DATE_FORMAT DATE_SUB DAY DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR EXTRACT FROM_DAYS HOUR LAST_DAY LOCALTIME LOCALTIMESTAMP MAKEDATE MAKETIME MICROSECOND MINUTE MONTH MONTHNAME NOW PERIOD_ADD PERIOD_DIFF QUARTER SECOND SEC_TO_TIME STR_TO_DATE SUBDATE SUBTIME SYSDATE TIME TIME_FORMAT TIME_TO_SEC TIMEDIFF TIMESTAMP TO_DAYS WEEK WEEKDAY WEEKOFYEAR YEAR YEARWEEK 高级函数 BIN BINARY CASE CAST COALESCE CONNECTION_ID CONV CONVERT CURRENT_USER DATABASE IF IFNULL ISNULL LAST_INSERT_ID NULLIF SESSION_USER SYSTEM_USER USER VERSION

MySQL 示例

MySQL 示例 MySQL 编辑器 MySQL 问答 MySQL 练习 MySQL 证书

MySQL UPDATE 语句

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MySQL UPDATE 语句

The UPDATE 语句用于修改表中现有的记录。

UPDATE 语法

UPDATE 表名
SET 列1 = 值1, 列2 = 值2, ...
WHERE 条件;

注意：在更新表中的记录时要小心！请注意 WHERE 语句中的子句。The WHERE 子句指定应更新的记录。如果省略 WHERE 子句，则将更新表中的所有记录！

演示数据库

以下是 Northwind 示例数据库中“Customers”表的选取内容

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Maria Anders Obere Str. 57 Berlin 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 墨西哥城 05021 墨西哥
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 墨西哥城 05023 墨西哥
4

 Around the Horn Thomas Hardy 120 Hanover Sq. 伦敦 WA1 1DP 英国

更新表格

以下 SQL 语句将更新第一个客户 (CustomerID = 1) 的新的联系人 _和_ 新的城市。

示例

UPDATE Customers
SET ContactName = 'Alfred Schmidt', City = 'Frankfurt'
WHERE CustomerID = 1;

"Customers" 表中的选择现在将如下所示

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Alfred Schmidt Obere Str. 57 法兰克福 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 墨西哥城 05021 墨西哥
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 墨西哥城 05023 墨西哥
4

 Around the Horn Thomas Hardy 120 Hanover Sq. 伦敦 WA1 1DP 英国

更新多条记录

是 WHERE 子句决定了要更新多少条记录。

以下 SQL 语句将把所有国家为“墨西哥”的记录的 PostalCode 更新为 00000

示例

UPDATE Customers
SET PostalCode = 00000
WHERE Country = 'Mexico';

"Customers" 表中的选择现在将如下所示

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Alfred Schmidt Obere Str. 57 法兰克福 12209 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 墨西哥城 00000 墨西哥
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 墨西哥城 00000 墨西哥
4

 Around the Horn Thomas Hardy 120 Hanover Sq. 伦敦 WA1 1DP 英国

更新警告！

更新记录时要小心。如果您省略 WHERE 子句，将更新 _所有_ 记录！

示例

UPDATE Customers
SET PostalCode = 00000;

"Customers" 表中的选择现在将如下所示

CustomerID CustomerName ContactName Address City PostalCode Country
1

 Alfreds Futterkiste Alfred Schmidt Obere Str. 57 法兰克福 00000 Germany
2 Ana Trujillo Emparedados y helados Ana Trujillo Avda. de la Constitución 2222 墨西哥城 00000 墨西哥
3 Antonio Moreno Taquería Antonio Moreno Mataderos 2312 墨西哥城 00000 墨西哥
4

 Around the Horn Thomas Hardy 120 Hanover Sq. 伦敦 00000 英国

用练习测试自己

练习

更新 Customers 表中所有记录的 City 列。

 Customers
 City = 'Oslo';

开始练习


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