![mysql - Is it required to have primary keys from both tables in lookup table as well? - Stack Overflow mysql - Is it required to have primary keys from both tables in lookup table as well? - Stack Overflow](https://i.stack.imgur.com/bNmbt.png)
mysql - Is it required to have primary keys from both tables in lookup table as well? - Stack Overflow
![database design - Should lookup tables enumerating strings have an integer primary key? - Software Engineering Stack Exchange database design - Should lookup tables enumerating strings have an integer primary key? - Software Engineering Stack Exchange](https://i.stack.imgur.com/wkZCW.png)
database design - Should lookup tables enumerating strings have an integer primary key? - Software Engineering Stack Exchange
![Øystein on MySQL Optimizer: What to Do When the MySQL Optimizer Overestimates the Condition Filtering Effect Øystein on MySQL Optimizer: What to Do When the MySQL Optimizer Overestimates the Condition Filtering Effect](https://3.bp.blogspot.com/-L9gYplZt96A/WNOcYrsmaWI/AAAAAAAAMqo/_2ZgZZ6pZf4YQqz7JYQ-62syXXnYbMI1wCLcB/s640/q21-57.png)
Øystein on MySQL Optimizer: What to Do When the MySQL Optimizer Overestimates the Condition Filtering Effect
![Example of synchronisation of look up table data from the InfoLab Lite... | Download Scientific Diagram Example of synchronisation of look up table data from the InfoLab Lite... | Download Scientific Diagram](https://www.researchgate.net/publication/237198229/figure/fig7/AS:668686536941582@1536438702638/Example-of-synchronisation-of-look-up-table-data-from-the-InfoLab-Lite-MySQL-DB-to-the.png)