Added 3 performance real world commits#236
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Hi,
As part of Assignment 8 (Performance - Section 2), I am submitting the solutions for 3 real-world SQL performance commits from Group 22.
The solutions have been formatted and appended to the answers file according to the required structure.
Commits Resolved:
6259fd82- Add missing index onwcf1_user.emailto avoid full table scans on login/duplicate checks5e89e3bf- Remove unusedCOUNT(*)aggregate from accomplishments queryf1752b54- Right-size oversizedVARCHAR(255)columns toVARCHAR(20)to reduce row and index sizeThanks.