查詢忽略WHERE子句當我有金額

Question

SQL查詢：SELECT sum(value) as valuee FROM table_name WHERE id = $id_session AND year = $year

此查詢不給我什麼。

但是，如果我不喜歡這樣寫道：

SELECT sum(value) as valuee FROM table_name - 作品，未經WHERE子句。

Answer 1

您可能未正確設置$id_session或$year。試試這個：

$sql = "SELECT sum(value) as valuee FROM table_name WHERE id = '$id_session' AND year = '$year'"; 
echo $sql; 

編輯

爲了節省未來的訪客一段時間，這是最終的結果作爲評論發表OP：

i had the wrong table name phpmyadmin. Now it is fine