FROM another_table WHERE condition; 或者如果你有一组具体的值要插入: INSERT INTO your_table (column1, column2, ...) VALUES (value1a, value2a, ...), (value1b, value2b, ...); 方法二:使用 DELETE 和INSERT 删除现有数据(使用 DELETE FROM): DELETE FROM your_table; 注意:这会逐行删除...
For all SQL Server installations, the most basic method ofperforming this actionis to use anINNER JOIN, whereby values in the columns of two different tables arecompared to one another. 对于所有SQL Server安装,执行此操作的最基本方法是使用INNER JOIN,从而将两个不同表的列中的值相互比较。 -- boo...
INSERT mytable (first_column) VALUES(‘some value’) [code] [code]INSERT anothertable(another_first,another_second) VALUES(@@identity,’some value’) 如果表mytable有一个标识字段,该字段的值会被插入表anothertable的another_first字段。这是因为变量@@identity总是保存最后一次插入标识字段的值。 字段ano...
4. Insert both from columns and defined values. In case you insert data into multiple columns, but only some columns need to import from the table_b, some columns need to import from another set of data: INSERT INTO table_a (col1a, col2a, col3a, col4a …) SELECT table_b.col1b...
Question: How can I create a table from another table without copying any values from the old table? Answer: To do this, the basic syntax is: CREATE TABLE new_table AS (SELECT * FROM old_table WHERE 1=2); For example: CREATE TABLE suppliers ...
For all SQL Server installations, the most basic method ofperforming this actionis to use anINNER JOIN, whereby values in the columns of two different tables arecompared to one another. 对于所有SQL Server安装,执行此操作的最基本方法是使用INNER JOIN,从而将两个不同表的列中的值相互比较。
CREATE TABLE student_old ( student_id INT , student_name VARCHAR(50), major VARCHAR(50), batch INT ); CREATE TABLE student_new ( student_id INT , student_name VARCHAR(50), major VARCHAR(50), batch INT ); INSERT INTO student_old(student_id, student_name, major, batch) VALUES (1, ...
4.10. Updating with Values from Another Table Problem You wish to update rows in one table using values from another. For example, you have a table called NEW_SAL, which holds the new salaries for certain employees. The contents of table NEW_SAL are: ...
增的基本语法:insert into 表名 (需要插入的列名,用逗号隔开) values (对应列名的值); 插入数据 通过sql查询发现,这本书《飘》已经放入了书架上,可供大家借用和查看。 太形象了,那如果我把书的作者写错了,那怎么办呢?再插入一条吗? 这个问题问的很好,因为人为的操作总会存在误差,因此提出了 改和 删 两种操...
If the UPDATE statement affects multiple records, to return the old and new values for each record, use the OUTPUT clause. Use caution when specifying the FROM clause to provide the criteria for the update operation. The results of an UPDATE statement are undefined if the statement includes a...