![]() Now it’s much easier to see which ones have the same filenames, once the ‘small’ and ‘big’ text has been removed by combining the REPLACE() and IF() MySQL functions. | content_id | image_small | image_large | matches | This adds an extra column called "matches" which will display 1 if the two filenames match or 0 if they don’t: +-+-+-+-+ IF(REPLACE(image_small, 'small', '') = REPLACE(image_large, 'big', ''), 1, 0) AS matches REPLACE(image_large, 'big', '') as image_large, REPLACE(image_small, 'small', '') as image_small, The query can be extended with an IF() to output 1 or 0 if the filenames (without the small and big parts) match. ![]() The only problem with the above example is that I now need to scan every row and see which ones do and dont’ match. | content_id | image_small | image_large | The REPLACE() function performs a case-sensitive replacement. The REPLACE() function is used to replace all the occurrences of a substring, with a new string. This is where the MySQL REPLACE() function comes into the picture. Sometimes, you may have to change the value of a substring within a string. Now, let us insert 3 more records in Sales table.+-+-+-+ In this tutorial, we will study the MySQL REPLACE() function. If you pass the values to the INSERT statement in the same order as in the table you can omit the column names − The syntax of using the REPLACE function in an UPDATE statement is as follows: UPDATE tblname SET fieldname REPLACE (fieldname, stringtofind, stringtoreplace) WHERE conditions Note that when searching for text to replace, MySQL uses the case-sensitive match to perform a search for a string to be replaced. Mysql> INSERT into sales (ID, ProductName, CustomerName, DispatchDate, DeliveryTime, Price, Location) values(1, 'Key-Board', 'Raja', DATE(''), TIME('11:00:00'), 7000, 'Hyderabad') Inserting records using REPLACE statementįollowing query inserts a row in the SALES table − If you verify the contents of the SALES table again you can observe the new record as shown below − | 1 | Mouse | Puja | | 10:59:59 | 3000 | Vijayawada |įollowing query replaces the above inserted record − | ID | ProductName | CustomerName | DispatchDate | DeliveryTime | Price | Location | The contents of the sales the will be as follows − If you try to insert another record with ID value 1 (since it has UNIQUE constraint) an error will be generated as shown below. Mysql> INSERT into sales values(1, 'Mouse', 'Puja', DATE(''), TIME('10:59:59'), 3000, 'Vijayawada') Definition of MySQL REGEXPREPLACE() REGEXPREPLACE() operator is used in the SELECT query, to replace the matched sub-string. ExampleĪssume we have created a table with name Sales in MySQL database with unique constraint to the ID column and inserted a record, as shown below Where, table_name is the name of the table into which you need to insert data, (column1, column2, lumnN) are the names of the columns and (value1, value2, value3.valueN) are the values in the record. REPLACE INTO table_name (column1, column2, lumnN) Syntaxįollowing is the syntax of the REPLACE statement of MySQL. In the case of the REPLACE statement if you try to insert a new column with duplicate value for the column with UNIQUE or PRIMARY KEY constraints the old record will be completely replaced by the new record. While inserting a record using the insert statement if a column has a UNIQUE or PRIMARY KEY constraint, if the new record has same value for this column an error will be generated. The replace statement is similar to the INSERT statement using this you can insert records into the specified table. In this, you need to specify the name of the table, column names, and values. You can add new rows to an existing table of MySQL using the INSERT statement.
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