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26 kwi 2012 · In my SQL, I am using the WHERE and LIKE clauses to perform a search. However, I need to perform the search on a combined value of two columns - first_name and last_name: WHERE customers.first_name + customers.last_name LIKE '%John Smith%'.
27 gru 2012 · $query = mysql_query("SELECT image_id FROM list WHERE (style_id = 24 AND style_value = 'red') OR (style_id = 25 AND style_value = 'big') OR (style_id = 27 AND style_value = 'round'); Try out this query.
1 lis 2018 · The two* (or more) values in parentheses is called a row-constructor. Other ways that express the same idea: -- works in PostgreSQL, DB2 SELECT whatever FROM t WHERE (col1, col2) IN ( VALUES (val1a, val2a), (val1b, val2b), ...)
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.!
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. The following shows the syntax of the WHERE clause:
To force the column names to be the same, wrap the query block on the left-hand side in a SELECT statement, and use aliases, like this: mysql> SELECT * FROM (TABLE t2) AS t(x,y) UNION TABLE t1; +------+------+ | x | y | +------+------+ | 1 | 2 | | 3 | 4 | | 4 | -2 | | 5 | 9 | +------+------+ 4 rows in set (0.00 sec)
A MySQL subquery is called an inner query whereas the query that contains the subquery is called an outer query. A subquery can be used anywhere that expression is used and must be closed in parentheses.
