WebThe UNPIVOT clause transforms multiple columns into multiple rows used in SELECT clause. ... Contains columns in the FROM clause, which specifies the columns we want to unpivot. name_column. The name for the column that holds the names of the unpivoted columns. values_column. WebJun 22, 2024 · How to use MySQL DISTINCT clause on multiple columns? MySQL MySQLi Database We can use the DISTINCT clause on more than columns in MySQL. In this case, the uniqueness of rows in the result set would depend on the combination of all columns. Example Consider the following table ‘testing’ having 10 rows −
Using CASE to Add Logic to a SELECT LearnSQL.com
WebJun 19, 2013 · Multiple columns in IN clause Rahul_India Jun 19 2013 — edited Jul 3 2013 Hi, select * from nrc_trans_descr where type_id_nrc=60013 -- it has 18 columns and i have hard coded 60013 for simplification here.60013 is derived from 3 other table Output is ( it can have many rows too.typically for each type_id_nrc there is one row ). As mentioned by @cataclysm using two IN statements can do the trick as well, perhaps it will even outperform the other solutions. However, what you should be very carefull with is code duplication. If you ever want to select from a different table, or change the where statement, it is an increased risk that you create … See more This is a very concise way to join, but unfortunately most SQL dialects, including SQL server do not currently suppport it. See more The reason why I don't recommend using an inner join as a filter, is because in practice people often let duplicates in the right table cause duplicates in the left … See more china home theater price in chennai
SQL SELECT with DISTINCT on multiple columns - w3resource
WebApr 10, 2024 · A column subquery returns a single column of multiple rows as its result. It can be used in the SELECT or WHERE clause to retrieve a list of values for comparison. The first example in common uses cases( filtering results ) is an example of a column subquery where the subquery gives a column of customer IDs WebFeb 20, 2024 · transform ( function ( $v) use ( $columns) { $clause = []; foreach ( $columns as $index => $column) { $clause [] = [ $column, '=', $v [ $index ]]; } return $clause ; }) -> each ( function ( $clause, $index) use ( $query) { $query -> where ( $clause, null, null, $index === 0 ? 'and' : 'or' ); }); return $query ; } } … WebJul 6, 2024 · Yes. You can use correlated subquery to handle multiple columns in where clause. You can correlate both outer and table within subquery on WHERE clause columns. You can use EXISTS condition to evaluate multiple columns in the WHERE clause. This method you can use if you are using a subquery. china-hometown