To copy the table structure without copying data, use SQL commands or graphics tools. ① Use CREATE TABLE new_table LIKE original_table in MySQL; copy structure and index; ② You can also use CREATE TABLE new_table AS SELECT * FROM original_table WHERE 1=0; but the primary key and index may be lost; ③ PostgreSQL supports CREATE TABLE new_table (LIKE original_table INCLUDING ALL); ④ SQL Server can use SELECT INTO combined with WHERE 1=0; ⑤ Oracle commonly used CREATE TABLE ... AS SELECT ... WHERE 1=0; ⑥ Graphic tools such as phpMyAdmin provide the "Copy structure only" option for easy operation; ⑦ Pay attention to syntax differences across databases and refer to official documents; ⑧ If you need to modify the structure after copying, you should record changes to avoid inconsistencies.
To copy the structure of a table without copying data, the method is not complicated. The key is to choose the right command or tool. Different database systems may be slightly different, but the core idea is the same: only copy the definition of the table (fields, types, constraints, etc.), and not copy the actual content .
Quickly copy structures using SQL commands
This is the most common and flexible approach, suitable for most relational database systems such as MySQL, PostgreSQL, and SQL Server.
In MySQL, you can write this:
CREATE TABLE new_table LIKE original_table;
This statement creates a new table new_table
, the structure is completely copied from original_table
, including column definitions, indexes, and properties, but does not copy any data.
If you also want to copy default values, comments and other details, you can also use it in some databases:
CREATE TABLE new_table AS SELECT * FROM original_table WHERE 1=0;
The principle of this statement is to avoid inserting any data through a condition that is always false, and only retaining the structure.
Note: This method sometimes loses index and primary key information, depending on the database system.
Using database management tools
For users who are not very familiar with SQL, graphical tools are a good choice. Tools like phpMyAdmin, DBeaver, or Navicat usually provide the functionality of "copy table structure" or "export table structure".
Take phpMyAdmin as an example:
- Open the table you want to copy
- Click the "Actions" tab in the top menu
- Find "Copy Table to (Different) Database" under "Table Options"
- Select the Structure Only option
- Enter the new table name and click to execute
The advantage of this type of tool is that it is intuitive, not prone to errors, and is suitable for use by non-technical personnel or temporary operations.
Differences between different database systems
Although the basic logic is the same, there are some differences in implementations of different database systems:
- MySQL : Supports
CREATE TABLE ... LIKE
andCREATE TABLE ... AS SELECT
- PostgreSQL : Support
CREATE TABLE new_table (LIKE original_table INCLUDING ALL);
to copy complete structures and properties - SQL Server : You can use
SELECT INTO
combined withWHERE 1=0
- Oracle : Commonly used
CREATE TABLE new_table AS SELECT * FROM original_table WHERE 1=0;
It is recommended to check the official documents based on the specific database system you are using to ensure that the syntax is accurate.
A few tips in practical applications
- If you only want to copy some fields, you can specify the field list when
CREATE TABLE AS SELECT
- Want to keep the comments from the original table? Remember to check whether the target database supports automatic replication of these meta information
- After copying the structure, if you need to add additional fields or modify constraints, it is best to record changes in time.
Basically these methods are all. Although they seem simple, a slight negligence may lead to structural inconsistency or missing indexes. Especially when operating across databases, you should pay more attention to syntax differences.
The above is the detailed content of How to duplicate a table structure only?. For more information, please follow other related articles on the PHP Chinese website!

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