FROM another_table; 1. 2. 3. 这段代码会将another_table表中的column_name字段数据插入到new_table表的name字段中。 3. 执行like查询 最后,我们可以执行like查询来实现“一个表中的字段like另一个表字段”的功能。下面是like查询的SQL代码: SELECT * FROM new_table WHERE
CREATE TABLE ... LIKE to create an empty table based on the definition of another table, including any column attributes and indexes defined in the original table: CREATE TABLE new_tbl LIKE orig_tbl; The copy is created using the same version of the table storage format as the original ...
LIKE to create an empty table based on the definition of another table, including any column attributes and indexes defined in the original table: CREATE TABLE new_tbl LIKE orig_tbl; For more information, see Section 13.1.18.3, “CREATE TABLE ... LIKE Statement”. [AS] query_expression ...
I am breaking up a large table into months. I need a statement that will create a table based on another table. The table I'm creating needs to have exactly the same column names and column definitions as the original. It should not however copy over any of the original table's rows....
匹配部分精确而其它部分进行范围匹配(Match one part exactly and match a range on another part):可以利用索引查找last name为Allen,而first name以字母K开始的人。 仅对索引进行查询(Index-only queries):如果查询的列都位于索引中,则不需要读取元组的值。 由于B-树中的节点都是顺序存储的,所以可以利用索引进行...
10.表的数据嵌入 mysql>insert into table01 (field01, field02, field03, field04, field05) values ->(2, ’second’, ’another’, ’1999-10-23’, ’10:30:00’); Query OK, 1 row affected (0.00 sec) 标准日期格式是"yyyy-mm-dd"。 标准时间格式是"hh:mm:ss"。 引号内要求所给的是上述...
CREATE TABLE T1(A INT PRIMARY KEY, B INT, C CHAR(1)) ENGINE=InnoDB; 代码语言:javascript 代码运行次数:0 运行 AI代码解释 INSERTINTOT1VALUES (1,2,'a'), (2,3,'b'), (3,2,'c'), (4,3,'d'), (5,2,'e');COMMIT;ALTERTABLET1ADDINDEX(B),ADDUNIQUEINDEX(C); ...
说明:You cannot delete a row that contains a primary key that is used as a foreign key in another table. 4. MySQL8新特性:计算列 什么叫计算列呢?简单来说就是某一列的值是通过别的列计算得来的。例如,a列值为1、b列值为2,c列不需要手动插入,定义a+b的结果为c的值,那么c就是计算列,是通过...
SHOW GLOBAL VARIABLES LIKE 'tx_isolation' # 查看当前的隔离级别 SHOW CREATE VIEW view_name; # 查看试图创建时所用的语句,同理SHOW CREATE TABLE tb_name;可以查看创建表所用的语句。 SHOW MASTER STATUS; #查看当前使用的二进制日志文件 SHOW BINLOG EVENTS IN 'log_name' [FROM position];# 查看事件(...
| safe_log_t1h | CREATE TABLE `safe_log_t1h` ( `id_cadastro` int(5) unsigned NOT NULL DEFAULT '0', `clicks` int(2) unsigned DEFAULT '0' ) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 INSERT_METHOD=LAST UNION=(); The UNION is empty!!! How can I create another table with...