Updating in mysql


24-Jun-2017 13:32

updating in mysql-34

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Getting the most from my software is more important than dreaming of “platform-independent” queries.

Sometimes a proprietary extension to standards provides something unavailable by any other means.

In the following rows of item table, 'value' column which is marked with red rectangle will be updated.

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).

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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.

It happens a lot when I’m working with a client who has multiple versions of data in different spreadsheets, and I’m tasked with tidying it all up, standardizing formatting and importing it into a relational database.



For the single-table syntax, the UPDATE statement updates columns of existing rows in the named table with new values. The SET clause indicates which columns to modify and the values they should be given. Each value can be given as an expression, or the keyword DEFAULT to set a column explicitly to its default value.… continue reading »


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Aug 28, 2016. MYSQLHow to update data in a table part-5 In MySQL tutorial we will show how to MySQL set or MySQL update set a values into a table. MySQL includes MySQL up.… continue reading »


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