Itqualityassurance
- Can a table have multiple columns?
- What is the maximum number of columns in table?
- Can a database table have too many columns?
Can a table have multiple columns?
A table can have just one primary key constraint, but that may be comprised of several columns e.g. create table my_table (col1 integer, col2 integer, col3 integer, primary key (col1, col2, col3) ); In addition to the primary key, a table may also have one or more UNIQUE constraints, e.g.
What is the maximum number of columns in table?
Yes, the maximum is constrained by the maximum number of columns in a SQL table (1024), but it is not 1024; it will always be less than that. This is for two reasons: OOB when you create a table, several columns are added, and not all of them are visible to you (metadata)
Can a database table have too many columns?
Column Count Limits
MySQL has hard limit of 4096 columns per table, but the effective maximum may be less for a given table.
