SQL计数出现的值

Question

我正在尝试计算SQL中值的出现次数

id   |   my_id   |   field_number   |   field_id   |   value
------------------------------------------------------------
1    |    101    |       78         |     88       |   apple
2    |    287    |       76         |     55       |   orange
3    |    893    |       45         |     33       |   orange
4    |    922    |       23         |     33       |   grape
5    |    198    |       09         |     88       |   raisin
6    |    082    |       55         |     88       |   apple

如果我使用以下内容，那么它正确地告诉我有3个field_id的值为88 .....

$count = $wpdb->get_results("SELECT COUNT(*) as count FROM wp_db1 WHERE field_id=88");

但如果我尝试这样做：

$count = $wpdb->get_results("SELECT COUNT(*) as count FROM wp_db1 WHERE value=apple");

然后它不起作用。有人可以帮忙吗？

Answer 1

您错过了apple周围的引号：

$count = $wpdb->get_results('SELECT COUNT(*) as count FROM wp_db1 WHERE value="apple"');