The field properties of multiple tables are all the same, how to write a script gracefully to concatenate the select results of all tables?

has N tables, indicating a string "table1","table2","table3"."tableN". The fields of these tables are all the same. Now take out the same fields from these N tables. How should sql write?
select field1,field2
from table1---tableN
this N represents dynamic change, what should I do? Thank you

There are so many

tables that you cannot write union one by one by hand

False
Jul.19,2022 
union 

,
1-n  sql1 - sqln
,n ,

this requirement can be implemented in several ways, but which one to use depends on the usage scenario:

  1. the SQL of all tables is dynamically generated by defining union through database access frameworks such as MyBatis
  2. query the data of each table separately through the program, and then integrate
    3. in memory.
  3. define database stored procedures for processing (similar to method 2, but do not rely on other programs)

isn't it easy?

write a function to generate sql through scripting language

cannot be handwritten, so code generation

Previous: How to find a suitable one among many development positions

Next: Type inference of Null and Undefined

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b32a05-2b377.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b32a05-2b377.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?