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The command to modify data in the table in sql is

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SQL 中最常用的修改表中数据的命令是 UPDATE,用于更新满足条件的行的指定列的数据。命令语法如下:UPDATE table_name SET column_name = new_value WHERE condition;。例如:UPDATE customers SET address = '123 Main Street' WHERE name = 'John' AND age > 30; 会将表 "customers" 中 "name" 列为 "John" 且 "age"

The command to modify data in the table in sql is

SQL 中修改表中数据的命令

SQL 中最常用的修改表中数据的命令是:

UPDATE

语法:

<code class="sql">UPDATE table_name SET column_name = new_value
WHERE condition;</code>
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作用:

  • UPDATE 命令用于更新指定表中满足条件的行的指定列中的数据。

参数:

  • table_name:要更新的表名。
  • column_name:要更新的列名。
  • new_value:要更新为的新值。
  • condition:可选,指定要更新的行。如果不指定条件,则更新表中的所有行。

示例:

以下命令将表 "customers" 中 "name" 列为 "John" 且 "age" 列大于 30 的所有行的 "address" 列更新为 "123 Main Street":

<code class="sql">UPDATE customers SET address = '123 Main Street'
WHERE name = 'John' AND age > 30;</code>
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