我如何在MySQL中編寫這個？

Question

我想搜索MySQL數據庫，將列列表與數組進行比較。我將如何做到這一點，可能全部在MySQL內部？

這裏就是我想在PHP做：

<?php 
$array = array("a", "b", "c", "d"); 
// 'c' doesn't exist in the database 
$result = $this->mysqli->query("Query"); 
// Result should be array("a", "b", "d") 
?> 

我將如何做到這一點？

Answer 1

你可以用the IN clause來做到這一點。

SELECT * FROM <table> WHERE <col> IN <array> 

Answer 2

試試這個：

// The array 
$array = array("a", "b", "c", "d"); 

// This takes the array and puts it into a string like "a,b,c,d" 
$array_for_query = implode(',', $array); 

$result = $this->mysqli->query("SELECT * FROM table WHERE the_letter IN ({$array_for_query})"); 

分別替換table和the_letter與表和列名。