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9 gru 2012 · Use the LENGTH() string function and a boolean AND. UPDATE mytable SET IDName = @CName WHERE LENGTH(@CName) > 0 AND mytable.ID = @CID. In order for the update to take place, both conditions must be true, but the WHERE clause conditions don't necessarily have to apply to table columns.
Notice the . WHERE clause in the UPDATE statement. The WHERE clause specifies which record (s) that should be updated. If you omit the WHERE clause, all records in the table will be updated! Demo Database. Below is a selection from the "Customers" table in the Northwind sample database: UPDATE Table.
The WHERE clause, if given, specifies the conditions that identify which rows to update. With no WHERE clause, all rows are updated. If the ORDER BY clause is specified, the rows are updated in the order that is specified. The LIMIT clause places a limit on the number of rows that can be updated.
CHAR_LENGTH(str) Returns the length of the string str, measured in code points. A multibyte character counts as a single code point.
1 sty 2006 · UPDATE wp_postmeta SET meta_value = DATE_FORMAT(meta_value, '%Y%m%d'); or if it is a string then use. UPDATE wp_postmeta SET meta_value = DATE_FORMAT(STR_TO_DATE(meta_value, '%d/%m/%Y'), '%Y%m%d'); More on MySQL date functions
The UPDATE statement updates data in a table. It allows you to change the values in one or more columns of a single row or multiple rows. The following illustrates the basic syntax of the UPDATE statement: UPDATE [LOW_PRIORITY] [IGNORE] table_name . SET . column_name1 = expr1, column_name2 = expr2, ... [WHERE .
15 cze 2012 · In that case you have a couple of options: 1) Change the datatype of the column and then execute your update to left pad with 0: alter table zipcode. modify column zipcode char(5) not null; update zipcode. set zipcode = lpad(zipcode,5,'0') where char_length(zipcode) < 5;
