Explain Query (mysql)
EXPLAIN SELECT
c.type,
c.credit_card_popup_id,
u.first_name,
u.user_id
FROM
credit_card_popup c
INNER JOIN
subscriptions s ON s.user_id = c.user_id AND
s.active = 1
INNER JOIN
users u ON u.user_id = s.user_id
WHERE
c.user_id = '308842' AND
c.seen = 0
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | SIMPLE | s | const | uniq_sub_per_user, idx_user_id, subscriptions_active_index | uniq_sub_per_user | 4 | const | 1 | 100.00 | ||
| 1 | SIMPLE | u | const | PRIMARY | PRIMARY | 4 | const | 1 | 100.00 | ||
| 1 | SIMPLE | c | ref | idx_credit_card_popup_user_id | idx_credit_card_popup_user_id | 4 | const | 1 | 10.00 | Using index condition; Using where |