[英]Create Relationship Between All Elements in an Array SQL query.
我有一系列名稱:
$names = array('ray'=>0,'bob'=>1,'sue'=>2,'jeff'=>3);
然后,我有了一個表,用於存儲數組中每個關鍵字之間的關系:
+----------+----------+
| id_a | id_b |
+----------+----------+
| 0 | 1 |
+----------+----------+
| 0 | 2 |
+----------+----------+
| 0 | 3 |
+----------+----------+
| 1 | 2 |
+----------+----------+
| 1 | 3 |
+----------+----------+
| 2 | 3 |
+----------+----------+
目前,我存儲關系的功能是:
foreach($names as $name=>$id_a){
foreach($names as $n2=>$id_b){
if($name != $n2){
INSERT INTO relationships (id_a,id_b) VALUES ($id_a,$id_b);
}
}
array_shift($names);
}
我想知道是否有更快的SQL解決方案來處理此類操作?
您可以先構建插入的值數組,然后通過單個查詢將其全部插入; 那會更快。 查詢看起來像...
INSERT INTO relationships (id_a, id_b) VALUES (0, 1), (0, 2), (0, 3);
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