mysql - Can't Update and Delete data - SQL -

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i've create table , add data rows. need delete rows, can't using mysql-wokbench. delete rows disabled. can't edit data, when choose "edita table data". can me? why so?enter image description here

i can not delete hand, using workbench. can't sql query.

in order able edit result set query select * table table must have primary key defined, wb uses find record.


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