# Synchronize ODK with database for more than Upload

**URL:** <https://forum.getodk.org/t/synchronize-odk-with-database-for-more-than-upload/24837>\
**Category:** Support\
**Created:** [February 12, 2020, 2:50pm UTC](https://forum.getodk.org/t/synchronize-odk-with-database-for-more-than-upload/24837 "2020-02-12T14:50:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ps\_lachute](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/ps_lachute/32/10366_2.png) [@ps\_lachute](https://forum.getodk.org/u/ps_lachute)\
**Post date:** [February 12, 2020, 2:50pm UTC](https://forum.getodk.org/t/synchronize-odk-with-database-for-more-than-upload/24837/1 "2020-02-12T14:50:09Z")

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is it possible to synchronize ODK with my Postgresql database not only during an upload. Let me explain, we would like to be able to use ODK Collect via a tablet to identify each visitor to our center, but to be able to create a file, which would be available to him each time the visitor returns. He may come 3 times a day. How can I make sure that in ODK Collect I can find out if my visitor has already come during the day or week? The employee needs to find the file quickly

Ubuntu server - PostsgreSQL - ODK Collect Agregate

**3. What you have you tried to fix the problem?**

External Select but i need more

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**Author:** ![ps\_lachute](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/ps_lachute/32/10366_2.png) [@ps\_lachute](https://forum.getodk.org/u/ps_lachute)\
**Post date:** [February 13, 2020, 3:19pm UTC](https://forum.getodk.org/t/synchronize-odk-with-database-for-more-than-upload/24837/2 "2020-02-13T15:19:27Z")

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I have the impression that ODK X would meet my needs. If I am wrong, let me know, otherwise we can consider the problem as resolved

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**Author:** ![elmps2018](https://getodk.b-cdn.net/user_avatar/forum.getodk.org/elmps2018/32/2063_2.png) [@elmps2018](https://forum.getodk.org/u/elmps2018)\
**Post date:** [February 13, 2020, 6:54pm UTC](https://forum.getodk.org/t/synchronize-odk-with-database-for-more-than-upload/24837/3 "2020-02-13T18:54:20Z")

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Hi @ps_lachute!

You have answered your own question 🙂 ODK does not (yet) have longitudinal capability, but ODK-X does, and there are some examples, like the longitudinal clinic study:  
[https://docs.opendatakit.org/odk-x/hope-study-intro/](https://docs.opendatakit.org/odk-x/hope-study-intro/)  
that may be particularly helpful.