sqlite - Update records based on other records in the same table -

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i have table (pump_table) pump flow (pump_flow), pump station names (name) , sub name (sub_name) information, presented in table extract below:

enter image description here

i transfer pump_flow value sub_name pump 1 pump_flow field sub_name; pump 2, pump 3,... pump n, of pump station having same name.

the script i've created looks this:

    update [pump_table]     set [pump_flow] = (                       select [pump_flow]                       [pump_table]                       [name] = [name]                       , [sub_name] = "pump 1"                       )     [name] = [name]     , [sub_name] != "pump 1"     ;

it keeps on returning value pump_flow field of first record in table has 'pump 1' in sub_name field.

the filter name = name matches.

to refer value in table, must use table name. if other table instance of same table, must rename 1 table:

update pump_table set pump_flow = (select pump_flow                  pump_table p1                  p1.name = pump_flow.name                    , sub_name = 'pump 1') sub_name != 'pump 1';

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