unique-constraint

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How can I do 'insert if not exists' in MySQL?
warren_44180
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1023
11
997664
sql-insert primary-key unique-constraint mysql sql
Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
user_1227920
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248
4
235750
unique-constraint indexing postgresql sql database
How can I create a SQL unique constraint based on 2 columns?
user_2250
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63
5
68976
unique-constraint sql-server-2005 constraints sql-server-2008 sql-server
How do you validate uniqueness of a pair of ids in Ruby on Rails?
user_349350
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55
6
36247
validation unique-constraint model ruby-on-rails
How do I specify unique constraint for multiple columns in MySQL?
Niyaz_1840
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1000
14
626191
database-table unique-constraint composite-key mysql
How do I ALTER a PostgreSQL table and make a column unique?
ghoseb_80240
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263
3
178810
unique-constraint postgresql sql
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