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Nik Milaserdov
Is there any official tutorial(s) or handbook about SOQL?
Can anyone share if it exists, as there is very little information on the Internet
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Please find below the link where SOQL is explained in detailed manner.In the subtopics, you will get more idea on how and where the queries are used.
https://developer.salesforce.com/docs/atlas.en-us.soql_sosl.meta/soql_sosl/sforce_api_calls_soql.htm
Giving the trailhead link also.
https://trailhead.salesforce.com/en/content/learn/modules/apex_database/apex_database_soql
Please mark it best answer if it helps you.
Regards
Neethu