For more information, see Section 13.1.18.3, “CREATE TABLE ... LIKE Statement”. [AS] query_expression To create one table from another, add a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl AS SELECT * FROM orig_tbl; For more information, see Secti...
mysql>CREATETABLEt1(aINT,bINT);QueryOK,0rowsaffected(0.06sec)mysql>SELECTtable_id,name,instant_colsFROMinformation_schema.innodb_tablesWHEREnameLIKE'%t1%';+---+---+---+|table_id|name|instant_cols|+---+---+---+|1065|test/t1|0|+---+---+---+1rowinset(0.22sec)mysql>SELECTtable_...
CREATE TABLE `test_table` ( `name` varchar(32) DEFAULT NULL, `desc` varchar(32) DEFAULT NULL, `age` int(16) DEFAULT NULL, `id` bigint(11) DEFAULT NULL, KEY `idx_age` (`age`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; 存在索引 `idx_age` 的情况下,查询执行计划如下: 代码语言:java...
--echo Another sql_mode test echo should return only 1 row; query_get_value 语法: query_get_value(query, col_name, row_num) 获得query 返回的结果中某行某列的值。 示例: 假如.test 文件内容如下: CREATE TABLE t1(a INT, b VARCHAR(255), c DATETIME); SHOW COLUMNS FROM t1; let $value...
CREATE TABLE ... SELECT Statement 13.1.18.4 CREATE TABLE ... SELECT Statement You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * FROM orig_tbl; ...
as a foreign key in another table. 4. MySQL 8 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,是通过别的列计算得来的。 在MySQL 8.0中,CREATE TABLE 和 ALTER TABLE 中...
-- 主mysql>createtabletest.t3(aint); Query OK,0rowsaffected (0.01sec) mysql>-- 从mysql>desctest.t3; ERROR1146(42S02):Table'test.t3'doesn't exist -- 60s后 mysql> desc test.t3; +---+---+---+---+---+---+ | Field | Type | Null | Key | Default...
Re: Update from another table where partial string exist in other table Sébastien F. May 27, 2022 04:42PM Re: Update from another table where partial string exist in other table Gideon Engelbrecht May 27, 2022 11:54PM Sorry, you can't reply to this topic. It has been closed. ...
INSERT INTO table_name(column_list) SELECT select_list FROM another_table WHERE condition; INSERT ON DUPLICATE KEY UPDATE statement(插入更新数据)如果目标表里已经存在相同的主键,则执行下面的更新字段的SQLINSERT INTO table (column_list) VALUES (value_list) [SELECT ...FROM ... WHERE] ON DUPLICATE ...
createPool(...); pool.getConnection(function(err, connection) { if (err) throw err; // not connected! // Use the connection connection.query('SELECT something FROM sometable', function (error, results, fields) { // When done with the connection, release it. connection.release(); // ...