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Hi Team, Do you have any idea about how to check data in mirror table in DB? Please let me know if

U03BC5A43CL
U03BC5A43CL Posts: 15 🧑🏻‍🚀 - Cadet
edited June 2022 in Slack General

Hi Team,

Do you have any idea about how to check data in mirror table in DB?

Please let me know if you have any idea about this.

Thanks in advance

Comments

  • fsmeier
    fsmeier Senior Software Engineer & Developer Enablement Advocate Sprykee Posts: 1,051 ⚖️ - Guardians (admin)

    Hey, what kind of data and what do you mean with “mirror table”? - And what do you mean with “check” ? Just visually?

  • Alberto Reyer
    Alberto Reyer Posts: 690 🪐 - Explorer
    edited June 2022

    I assume you want to compare two tables with the same structure if one of the table is missing an entry that the other one has:

    SELECT 
table_a.field_1, 
table_b.field_1 
FROM table_a 
FULL OUTER JOIN table_b ON table_a.id = table_b.id
 WHERE table_a.field_1 IS NULL OR table_b.field_1 IS NULL

    that would give you all entries that only exist in one of the tables.

    Please be aware that these will do a full table scan on both tables, so it's performance sensitive and should not be executed on large tables in a production system.

  • U0208K3V15W
    U0208K3V15W Posts: 33 🧑🏻‍🚀 - Cadet
    edited June 2022

    You can using cron job to count number record in ''mirror table" and compare with "entries table"

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