I needed to delete a bunch (Over 100) of child terms from a Vocabulary and save the parents.
I needed to do this without sitting in front of a web browser and waiting for a page to load every time.
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Anyway... I'll cut to the chase... then explain. here are the queries I ran:
mysql> create table temp1 as select d.*,h.parent from term_data d, term_hierarchy h where d.tid=h.tid and d.vid=21 and h.parent!=0;
I'm probably wrong about this and just don't know how to do it... but I was unable to delete rows from multiple tables at a time so I created a temp table from the select statement above which included all the terms that were not parent terms (parent != 0)
mysql> delete from term_data where tid in (select tid from temp1);
Delete the terms that exist in the temp table.
mysql> delete from term_hierarchy where tid in (select tid from temp1);
Query OK, 139 rows affected (0.18 sec)
Delete the terms from hierarchy that exist in the temp table.