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Results tagged with mysql
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user 43504
All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.
6
votes
How to insert values into a table from two different tables?
The easiest way you can do this is using sub queries:
INSERT INTO classroom(teacher_id,student_id)
VALUES ((SELECT id FROM students WHERE s_name='sam'),
(SELECT id FROM teacher WHERE t_name='david …
- 300
11
votes
Accepted
what is '#' in create table statement?
Temporary tables are available in MySQL version 3.23 onwards. If you use an older version of MySQL than 3.23, you can't use temporary tables, but you can use heap tables. …
- 300
0
votes
SQL - query multiplying records returned - Cartesian Product
Cartesian product of two tables multiplies every row with every other row which should not happen.I would explain this using this example.
You can see that result is somewhat undesired as some of th …
- 300
1
vote
How do I extract row/column elements from multiple tables with same schema in single query
Simplest way would be to use UNION:
SELECT * FROM A
UNION
SELECT * FROM B
UNION
SELECT * FROM C
or use a JOIN:
SELECT *
FROM A
FULL OUTER JOIN B
ON < A.name=B.name>;
Read more about jo …
- 300