mysql - Is it ever practical to store primary keys of one table as text in another table? -


imagine if had millions of rows in table a.

for each large row (10+ columns) of table a, might have 20+ rows exact duplicates except singular column store id table b.

would more efficient and/or memory saving store in table a, id's table b in text field ---> "b_id1|b_id2|b_id3" etc , return data client-side, parse it, , send out actual data table b.

this assuming had 2+ million rows of unique data in table , if stored additional column outside text field, add 2 million*20+ rows individual table wasted space.

or naive in approach , understanding of sql? literally started using week ago , taught myself basics app.

this weak entity (table) best used.

instead of duplicating data in table a, create new table links b. in it, can have id table links several id's in table b (and set primary key both of foreign keys).


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