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Tag: inner-join

Combine table data in MySQL using JOIN

I’m trying to join two tables in MySQL, in one I have a set of IDs (of the type GTEX-14BMU-1526-SM-5TDE6) and a set of type’s of tissue(SMTS), I have to select the IDs for the tissue type ‘Blood’ (which is another column of the same table), and then I have to take only the first two strings (GTEX-14BMU) from the

subquery shows more that one row group by

I am trying to get the data for the best 5 customers in a railway reservation system. To get that, I tried getting the max value by summing up their fare every time they make a reservation. Here is the code. this throws the error:[21000][1242] Subquery returns more than 1 row If I remove the group by from the subquery

SELECT NOT IN with multiple columns in subquery

Regarding the statement below, sltrxid can exist as both ardoccrid and ardocdbid. I’m wanting to know how to include both in the NOT IN subquery. Answer I would recommend not exists: Note that I changed the table aliases to things that are more meaningful. I would strongly recommend prefixing the column names with the table they belong to, so the

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