A: create table a1 like a; insert into a1 as select * from a; B: create table b1 as select * from b; 测试AB两种建表语句对原始表的影响.其中a.b的数据量均为300000 rows. 如果使用A种方式建表,insert过程可能会堵塞DML操作 如果使用B中方式建表,此建表过程全程锁表: 建议:生产环境使用A种方式建备份表:…

hive建表语句DML:https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-CreateTable 创建表: hive> CREATE TABLE pokes (foo INT, bar STRING);          Creates a table called pokes with two columns, the first being an integer and…

create table xxx )       | NO   | PRI | NULL    | auto_increment | | Name       | varchar() | NO   |     | NULL    |                | | Age        | )       | NO   |     |        |                | | updatetime | datetime     | YES  |     | NULL    |…

create table repo_folder_operate_log_bak as select * from repo_folder_operate_log;…

1. var result = db.foo.aggregate(...);db.bar.insert(result.result); 2. var temp1 = db.mtb1.find(name:"joe");while(temp1.hasNext()) db.tab2.insert(temp1.next()); 相当于sql中:create table tab2 as select * from mtb1 where name='joe';…

oracle下直接(创建表) create table newtablename as select * from oldtablename sqlserver的语法是(自动创建表) : select * into newtablename from oldtablename…

用复制方式创建表 Create Table tbname as select * from user.tab where ...…

案例中: 索引丢失.分区丢失 实际测试 Target Server Type : MYSQLTarget Server Version : 50616File Encoding : 65001 Date: 2019-03-20 15:08:45*/ SET FOREIGN_KEY_CHECKS=0; -- ------------------------------ Table structure for test_create_table-- -------------------------…

create table xxx as select create table table1 =; 根据table2的表结构,创建tables1 create table table1 as select * from table2 根据table2的表结构,创建tables1,同时将table2的数据插入table1 create table table1(column1_rename,column2_rename) as select column1,column2 from table2;…

create table  as select * from和insert into select from两种表复制语句区别 create table targer_table as select * from source_table insert into target_table(column1,column2) select column1,column2 from source_table 以上两句都是将源表source_table的记录插入到目标表target_table,但两句又…