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sql update 语法与实例

Jun 07, 2016 pm 04:18 PM
update Example grammar

sql update 语法与实例 在日常使用的数据库教程是一个不断变化的数据存储。在SQL是用于修改数据已经在数据库中的更新和删除commands.The更新语句可以更新表格中的一个或多个记录命令。 UPDATE table_name SET column_name = expression WHERE conditions 实

   sql update 语法与实例

  在日常使用的数据库教程是一个不断变化的数据存储。在SQL是用于修改数据已经在数据库中的更新和删除commands.The更新语句可以更新表格中的一个或多个记录命令。

  UPDATE table_name

  SET column_name = expression

  WHERE conditions

  实例一

  UPDATE AntiqueOwners

  SET Address = '77, Lincoln st.'

  WHERE OwnerFirstName= 'Jane' and OwnerLastName = 'Akins'

  更新语句可用于在更新的table.This声明一个字段会更新该AntiqueOwners表简埃金斯地址77,林肯圣..

  注:更新不生成结果集。如果你想知道哪些记录将被修改,,首先运行SELECT查询,它使用同样的标准。如果结果令人满意,然后运行更新查询。

  实例二

  UPDATE AntiqueOwners

  SET Address = '77, Lincoln st.', City = 'Kirkland', State = 'Washington'

  WHERE OwnerFirstName='Jane' And OwnerLastName='Akins'

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