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swap-salary.sql
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23 lines (21 loc) · 769 Bytes
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# Time: O(n)
# Space: O(1)
# Given a table salary, such as the one below, that has m=male and f=female values.
# Swap all f and m values (i.e., change all f values to m and vice versa) with a single update query and no intermediate temp table.
#
# For example:
# | id | name | sex | salary |
# |----|------|-----|--------|
# | 1 | A | m | 2500 |
# | 2 | B | f | 1500 |
# | 3 | C | m | 5500 |
# | 4 | D | f | 500 |
#
# After running your query, the above salary table should have the following rows:
# | id | name | sex | salary |
# |----|------|-----|--------|
# | 1 | A | f | 2500 |
# | 2 | B | m | 1500 |
# | 3 | C | f | 5500 |
# | 4 | D | m | 500 |
UPDATE salary SET sex = IF(sex = 'm', 'f', 'm')