如何在不从数据库表复制数据的情况下创建表结构？

Question

I was asked in a viva "how can you create a table structure without copying data from a database table?" I was quite sure with my answer. My answer was:`

CREATE TABLE new_table AS (SELECT *FROM old_table );

Was I right or wrong?

Answer 1

CREATE TABLE new_table AS (SELECT * FROM old_table where 0=1);

Answer 2

No. Your answer is incorrect. You can use this SQL query.

CREATE TABLE *new_table* AS (SELECT *FROM *old_table* WHERE *statement=false*);

Like this an example is following:

CREATE TABLE *new_table* AS (SELECT *FROM *old_table* WHERE *1=2*);

I think it will serve your purpose...:P

Answer 3

CREATE TABLE new_table AS SELECT * FROM old_table where 0=1;

在where子句中，我们可以使用任何不等式语句，例如1 = 2,2 = 3..etc。，这应该通知优化器这个'where'条件肯定会返回false，从而阻止从old_table复制任何数据。

Answer 4

if you are using workbench it has a option in left side of the screen "Data export" just click on it select the db you want to copy structure of and there will be a drop down option select "Dump structure only" and export to a folder.

import this file where ever you want using option data import restore and select path and type new schema name and import. you have new schema with the structure you want.