mysql - How to update one table from another table? -

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I want to update the rows from one table to another, both of which are the same structure and I use this query 

  as SAT ST.tag_uid = apprv.tag_uid, st.stk_id = apprv.stk_id as UPDATE bh_master_ritesh_stock; bh_stock_approval ashr approv WHERE st.stock_id = apprv.stock_id   
 but it gives me this error,  
  is an error in your SQL syntax; Where is my fault, check the manual that uses line 3 on 'Asperv WHERE st.stock_id = apprv.stock_id' near 'FRRO BH_stock_provals near the correct syntax for your MySQL server version. Or am I using the wrong query? Try this code:   
 
  
 Because  UPDATE  cant  Use  section    to

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