Which generates the most rows in MySQL? • SELECT 1 UNION SELECT 1 UNION SELECT 2;...
Which generates the most rows in MySQL?
• SELECT 1 UNION SELECT 1 UNION SELECT 2;
• SELECT 1 UNION SELECT 1 UNION SELECT 1;
• SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1;
• SELECT 1 UNION ALL SELECT 2 UNION SELECT 2;
Homework Answers
SELECT 1 UNION SELECT 1 UNION SELECT 2; ---- returns 2 rows
SELECT 1 UNION SELECT 1 UNION SELECT 1; ---- returns 1 row
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1; ------ returns 3 rows
SELECT 1 UNION ALL SELECT 2 UNION SELECT 2; ---- return 2 rows
Answer : C
SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1;
this my sql will returns 3 rows
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Which generates the most rows in MySQL?
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