MySQL - querying average row length

问题:

I have a table named rabbits. I am trying to find the average row length in my table. I tried this query:

SELECT AVG_ROW_LENGTH(rabbits)

but it doesn't work.

回答1:

My Googling has indicated that AVG_ROW_LENGTH is actually a column in information_schema.tables. You'll want to try something like this, I think:

SELECT AVG_ROW_LENGTH FROM information_schema.tables WHERE TABLE_NAME = 'rabbits';

You may also need to specify the database name by adding "AND TABLE_SCHEMA = 'databasename';" if you have more than one database with a rabbits table.

Hope this helps!

回答2:

You can't SELECT that, try this instead:

SELECT Avg_row_length FROM information_schema.tables WHERE table_name='rabbits';