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Mysql updating multiple rows

PHP Script Sample Output: Multiple Updates in My SQL Sample table: table1 Problem If you want to update the val1 with 5,8 and 7 for concerned id 1,3 and 4 and the other val1 will remain same and the val2 will be updated with 13 and 5 for the concerned id 2 and 4 and the other will remain same, the following update statement can be used by using IF and CASE.

Code: FROM book_mast; -------- ------------------------------------ --------- ---------- | book_id| book_name | pub_lang|book_price| -------- ------------------------------------ --------- ---------- | BK001 | Introduction to Electrodynamics | English | 85.00| | BK002 | Understanding of Steel Construction| English | 105.50| | BK003 | Guide to Networking | Hindi | 200.00| | BK004 | Transfer of Heat and Mass | English | 250.00| | BK005 | Conceptual Physics | NULL | 145.00| | BK006 | Fundamentals of Heat | German | 112.00| | BK007 | Advanced 3d Graphics | Hindi | 56.00| | BK008 | Human Anatomy | German | 50.50| | BK009 | Mental Health Nursing | English | 145.00| | BK010 | Fundamentals of Thermodynamics | English | 225.00| | BK011 | The Experimental Analysis of Cat | French | 95.00| | BK012 | The Nature of World | English | 88.00| | BK013 | Environment a Sustainable Future | German | 100.00| | BK014 | Concepts in Health | NULL | 180.00| | BK015 | Anatomy & Physiology | Hindi | 135.00| | BK016 | Networks and Telecommunications | French | 45.00| -------- ------------------------------------ --------- ---------- 16 rows in set (0.00 sec) and My SQL FROM purchase; --------- ---------- ------------- ------------ | book_id | pub_lang | purch_price | total_cost | --------- ---------- ------------- ------------ | BK001 | English | 75.00 | 1125.00 | | BK004 | English | 55.00 | 440.00 | | BK005 | NULL | 20.00 | 400.00 | | BK004 | English | 35.00 | 525.00 | | BK001 | English | 25.00 | 200.00 | | BK003 | Hindi | 45.00 | 900.00 | --------- ---------- ------------- ------------ 6 rows in set (0.02 sec) If we want to update the book_price of the table book_mast by an increment of 5% and also update the purch_price and total_cost of puchase table by an increment of 5%, and this increment will affect only those rows in both book_mast and purchase table, which publishing language is English and book_id matching in both the tables, we can write the following code - UPDATE book_mast,purchase SET book_mast.book_price=book_mast.book_price (book_mast.book_price*.05), purchase.purch_price=purchase.purch_price (purchase.purch_price*.05), purchase.total_cost=receive_qty*(purchase.purch_price (purchase.purch_price*.05)) WHERE book_mast.book_id=purchase.book_id AND purchase.pub_lang="English"; FROM book_mast; -------- ------------------------------------ --------- ---------- | book_id| book_name | pub_lang|book_price| -------- ------------------------------------ --------- ---------- | BK001 | Introduction to Electrodynamics | English | 89.25| | BK002 | Understanding of Steel Construction| English | 105.50| | BK003 | Guide to Networking | Hindi | 200.00| | BK004 | Transfer of Heat and Mass | English | 262.50| | BK005 | Conceptual Physics | NULL | 145.00| | BK006 | Fundamentals of Heat | German | 112.00| | BK007 | Advanced 3d Graphics | Hindi | 56.00| | BK008 | Human Anatomy | German | 50.50| | BK009 | Mental Health Nursing | English | 145.00| | BK010 | Fundamentals of Thermodynamics | English | 225.00| | BK011 | The Experimental Analysis of Cat | French | 95.00| | BK012 | The Nature of World | English | 88.00| | BK013 | Environment a Sustainable Future | German | 100.00| | BK014 | Concepts in Health | NULL | 180.00| | BK015 | Anatomy & Physiology | Hindi | 135.00| | BK016 | Networks and Telecommunications | French | 45.00| -------- ------------------------------------ --------- ---------- 16 rows in set (0.01 sec) and My SQL FROM purchase; --------- ---------- ------------- ------------ | book_id | pub_lang | purch_price | total_cost | --------- ---------- ------------- ------------ | BK001 | English | 78.75 | 1181.25 | | BK004 | English | 57.75 | 462.00 | | BK005 | NULL | 20.00 | 400.00 | | BK004 | English | 36.75 | 551.25 | | BK001 | English | 26.25 | 210.00 | | BK003 | Hindi | 45.00 | 900.00 | --------- ---------- ------------- ------------ 6 rows in set (0.08 sec) My SQL: Update with Join Statement Sample tables Problem If we want to update the aval1of table11 with the bval1 of table12 against the following condition - 1).

My SQL UPDATE using NULL My SQL UPDATE command can be used to update a column value to NULL by setting column_name = NULL, where column_name is the name of the column to be updated.While implementing multiple rows update or delete, we need to follow some steps.All the steps listed below is suitable for updating multiple rows.The following My SQL statement will update purch_price with purch_price multiplied by 5 if it satisfies the condition defined in the subquery started with SELECT wrapped within a pair of parenthesis.The subquery retrieves only those cate_ids from purchase table if their corresponding receive_qty is more than 10.

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The way you have this coded, you are going to load the table with the existing table data before updating the table.

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