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Posted by / 07-Jul-2017 03:49

Sql updating multiple tables at once

Where column_name is the name of the column to be updated and new_value is the new value with which the column will be updated.

The following My SQL statement will update receive_qty, pub_lang, and receive_dt columns with new values 20, Hindi and 2008-07-10 if purch_price is more than 50.

In other words, a target row shouldn’t join to more than one row from the other table(s).

If it does, then only one of the join rows will be used to update the target row, but which one will be used is not readily predictable.?

bval2 of table12 must be matched with the cval1 of table13 - then the following code can be used.

SELECT * FROM table_1 CROSS JOIN table_2;-- id | value1 | id | value2-- ---- -------- ---- ---------- 1 | a | 1 | W-- 1 | a | 1 | X-- 1 | a | 3 | Y-- 1 | a | 5 | Z-- 2 | b | 1 | W-- 2 | b | 1 | X-- 2 | b | 3 | Y-- 2 | b | 5 | Z-- 3 | c | 1 | W-- 3 | c | 1 | X-- 3 | c | 3 | Y-- 3 | c | 5 | ZSELECT * FROM table_1, table_2;-- id | value1 | id | value2-- ---- -------- ---- ---------- 1 | a | 1 | W-- 1 | a | 1 | X-- 1 | a | 3 | Y-- 1 | a | 5 | Z-- 2 | b | 1 | W-- 2 | b | 1 | X-- 2 | b | 3 | Y-- 2 | b | 5 | Z-- 3 | c | 1 | W-- 3 | c | 1 | X-- 3 | c | 3 | Y-- 3 | c | 5 | Z are equivalent.

My SQL UPDATE with subqueries Here in the following, we have discussed how to use My SQL UPDATE command with subqueries.

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.

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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).

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