mysql - 1062 Error (duplicate entry) with `ALTER IGNORE TABLE ADD PRIMARY KEY` query -

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as know docs , other questions such query should silently drop rows duplicated id. mysql throws error:

enter image description here

this phpmyadmin output.

why mysql did not dropped rows duplicated id? ideas?

looks looked in wrong docs. looked @ 5.1 version docs , have 5.5 version of mysql server.

in right docs mentioned:

enter image description here

so need consider using suggested set session old_alter_table=1 or find way remove excess rows table.


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