Select a random record with Oracle:
SELECT column FROM
( SELECT column FROM table
ORDER BY dbms_random.value )
WHERE rownum = 1
---
Select a random row with IBM DB2
SELECT column, RAND() as IDX
FROM table
ORDER BY IDX FETCH FIRST 1 ROWS ONLY
---
Select a random row with Microsoft SQL Server:
SELECT TOP 1 column FROM table
ORDER BY *NEWID()*
---
Select a random row with MySQL:
SELECT column FROM table
ORDER BY *RAND()*
LIMIT 1
---
Select a random row with PostgreSQL:
SELECT column FROM table
ORDER BY *RANDOM()*
LIMIT 1
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