freeCodeCamp/curriculum/challenges/chinese/07-scientific-computing-with-python/python-for-everybody/relational-databases-join-operation.md

---
id: 5e7b9f180b6c005b0e76f08f
challengeType: 11
videoId: jvDw3D9GKac
dashedName: relational-databases-join-operation
---

# --question--

## --text--

When using a JOIN clause in an SQL statement, what does ON do?

## --answers--

It indicates what tables to perform the JOIN on.

---

It specifies the fields to use for the JOIN.

---

It indicates how the two tables are to be joined.

## --video-solution--

3
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`---`
			`id: 5e7b9f180b6c005b0e76f08f`
			`challengeType: 11`
			`videoId: jvDw3D9GKac`
feat(curriculum): restore seed + solution to Chinese (#40683) * feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com> 2021-01-13 03:31:00 +01:00			`dashedName: relational-databases-join-operation`
fix: QA/Infosec update and python to chinese 2020-08-13 12:00:20 +02:00			`---`

chore(learn): Applied MDX format to Chinese curriculum files (#40462) 2020-12-16 00:37:30 -07:00			`# --question--`

			`## --text--`

			`When using a JOIN clause in an SQL statement, what does ON do?`

			`## --answers--`

			`It indicates what tables to perform the JOIN on.`

			`---`

			`It specifies the fields to use for the JOIN.`

			`---`

			`It indicates how the two tables are to be joined.`

			`## --video-solution--`

			`3`