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18 mar 2014 · In MySQL, can I select columns only where something exists? For example, I have the following query: select phone, phone2 from jewishyellow.users where phone like '813%' and phone2 I'm trying to select only the rows where phone starts with 813 and phone2 has something in it.
I'd like to write a SELECT statement that uses just one test to return columns with no value (null, empty, or all spaces). I thought this would work: SELECT column_name from table_name WHERE column_name NOT LIKE '%_%';
6 cze 2024 · We can use the function NULLIF to compare and check if the column contains null or empty values: SELECT id, name FROM Department WHERE NULLIF(TRIM(code), '') IS NULL; The NULLIF function evaluates its two arguments, returning NULL if they are equal.
WHERE Syntax. SELECT column1, column2, ... FROM table_name. WHERE condition; Note: The WHERE clause is not only used in. SELECT statements, it is also used in UPDATE, DELETE, etc.!
30 lis 2013 · I need to find out the records where the article_title data is the same on more than one record. Here's what I've got: select a.* from articles a where a.article_title = (select article_title from articles where article_title = a.article_title AND a.id <> articles.id)
2 lut 2024 · To ascertain if a column is empty or null in SQL, use COALESCE(column, ”) or column IS NULL OR column = ”. These queries fetch rows where the specified column contains an empty string or null value, ensuring comprehensive coverage of both scenarios.
Summary: in this tutorial, you will learn how to use the MySQL WHERE clause in the SELECT statement to filter rows from the result set. Introduction to MySQL WHERE clause. The WHERE clause allows you to specify a search condition for the rows returned by a query.
