Table: Signups
\n+----------------+----------+\n| Column Name | Type |\n+----------------+----------+\n| user_id | int |\n| time_stamp | datetime |\n+----------------+----------+\nuser_id is the column of unique values for this table.\nEach row contains information about the signup time for the user with ID user_id.\n\n\n
\n\n
Table: Confirmations
\n+----------------+----------+\n| Column Name | Type |\n+----------------+----------+\n| user_id | int |\n| time_stamp | datetime |\n| action | ENUM |\n+----------------+----------+\n(user_id, time_stamp) is the primary key (combination of columns with unique values) for this table.\nuser_id is a foreign key (reference column) to the Signups table.\naction is an ENUM (category) of the type ('confirmed', 'timeout')\nEach row of this table indicates that the user with ID user_id requested a confirmation message at time_stamp and that confirmation message was either confirmed ('confirmed') or expired without confirming ('timeout').\n\n\n\n\n
The confirmation rate of a user is the number of 'confirmed' messages divided by the total number of requested confirmation messages. The confirmation rate of a user that did not request any confirmation messages is 0. Round the confirmation rate to two decimal places.
Write a solution to find the confirmation rate of each user.
\n\nReturn the result table in any order.
\n\nThe result format is in the following example.
\n\n\n
Example 1:
\n\n\nInput: \nSignups table:\n+---------+---------------------+\n| user_id | time_stamp |\n+---------+---------------------+\n| 3 | 2020-03-21 10:16:13 |\n| 7 | 2020-01-04 13:57:59 |\n| 2 | 2020-07-29 23:09:44 |\n| 6 | 2020-12-09 10:39:37 |\n+---------+---------------------+\nConfirmations table:\n+---------+---------------------+-----------+\n| user_id | time_stamp | action |\n+---------+---------------------+-----------+\n| 3 | 2021-01-06 03:30:46 | timeout |\n| 3 | 2021-07-14 14:00:00 | timeout |\n| 7 | 2021-06-12 11:57:29 | confirmed |\n| 7 | 2021-06-13 12:58:28 | confirmed |\n| 7 | 2021-06-14 13:59:27 | confirmed |\n| 2 | 2021-01-22 00:00:00 | confirmed |\n| 2 | 2021-02-28 23:59:59 | timeout |\n+---------+---------------------+-----------+\nOutput: \n+---------+-------------------+\n| user_id | confirmation_rate |\n+---------+-------------------+\n| 6 | 0.00 |\n| 3 | 0.00 |\n| 7 | 1.00 |\n| 2 | 0.50 |\n+---------+-------------------+\nExplanation: \nUser 6 did not request any confirmation messages. The confirmation rate is 0.\nUser 3 made 2 requests and both timed out. The confirmation rate is 0.\nUser 7 made 3 requests and all were confirmed. The confirmation rate is 1.\nUser 2 made 2 requests where one was confirmed and the other timed out. The confirmation rate is 1 / 2 = 0.5.\n\n", "translatedTitle": null, "translatedContent": null, "isPaidOnly": false, "difficulty": "Medium", "likes": 589, "dislikes": 41, "isLiked": null, "similarQuestions": "[]", "exampleTestcases": "{\"headers\": {\"Signups\": [\"user_id\", \"time_stamp\"], \"Confirmations\": [\"user_id\", \"time_stamp\", \"action\"]}, \"rows\": {\"Signups\": [[3, \"2020-03-21 10:16:13\"], [7, \"2020-01-04 13:57:59\"], [2, \"2020-07-29 23:09:44\"], [6, \"2020-12-09 10:39:37\"]], \"Confirmations\": [[3, \"2021-01-06 03:30:46\", \"timeout\"], [3, \"2021-07-14 14:00:00\", \"timeout\"], [7, \"2021-06-12 11:57:29\", \"confirmed\"], [7, \"2021-06-13 12:58:28\", \"confirmed\"], [7, \"2021-06-14 13:59:27\", \"confirmed\"], [2, \"2021-01-22 00:00:00\", \"confirmed\"], [2, \"2021-02-28 23:59:59\", \"timeout\"]]}}", "categoryTitle": "Database", "contributors": [], "topicTags": [ { "name": "Database", "slug": "database", "translatedName": null, "__typename": "TopicTagNode" } ], 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"status": null, "sampleTestCase": "{\"headers\": {\"Signups\": [\"user_id\", \"time_stamp\"], \"Confirmations\": [\"user_id\", \"time_stamp\", \"action\"]}, \"rows\": {\"Signups\": [[3, \"2020-03-21 10:16:13\"], [7, \"2020-01-04 13:57:59\"], [2, \"2020-07-29 23:09:44\"], [6, \"2020-12-09 10:39:37\"]], \"Confirmations\": [[3, \"2021-01-06 03:30:46\", \"timeout\"], [3, \"2021-07-14 14:00:00\", \"timeout\"], [7, \"2021-06-12 11:57:29\", \"confirmed\"], [7, \"2021-06-13 12:58:28\", \"confirmed\"], [7, \"2021-06-14 13:59:27\", \"confirmed\"], [2, \"2021-01-22 00:00:00\", \"confirmed\"], [2, \"2021-02-28 23:59:59\", \"timeout\"]]}}", "metaData": "{\"mysql\": [\"Create table If Not Exists Signups (user_id int, time_stamp datetime)\", \"Create table If Not Exists Confirmations (user_id int, time_stamp datetime, action ENUM('confirmed','timeout'))\"], \"mssql\": [\"Create table Signups (user_id int, time_stamp datetime)\", \"Create table Confirmations (user_id int, time_stamp datetime, action 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\"time_stamp\": \"DATETIME\"}, \"Confirmations\": {\"user_id\": \"INT\", \"time_stamp\": \"DATETIME\", \"action\": \"ENUM('confirmed', 'timeout')\"}}}", "judgerAvailable": true, "judgeType": "large", "mysqlSchemas": [ "Create table If Not Exists Signups (user_id int, time_stamp datetime)", "Create table If Not Exists Confirmations (user_id int, time_stamp datetime, action ENUM('confirmed','timeout'))", "Truncate table Signups", "insert into Signups (user_id, time_stamp) values ('3', '2020-03-21 10:16:13')", "insert into Signups (user_id, time_stamp) values ('7', '2020-01-04 13:57:59')", "insert into Signups (user_id, time_stamp) values ('2', '2020-07-29 23:09:44')", "insert into Signups (user_id, time_stamp) values ('6', '2020-12-09 10:39:37')", "Truncate table Confirmations", "insert into Confirmations (user_id, time_stamp, action) values ('3', '2021-01-06 03:30:46', 'timeout')", "insert into Confirmations (user_id, time_stamp, action) values ('3', '2021-07-14 14:00:00', 'timeout')", "insert into Confirmations (user_id, time_stamp, action) values ('7', '2021-06-12 11:57:29', 'confirmed')", "insert into Confirmations (user_id, time_stamp, action) values ('7', '2021-06-13 12:58:28', 'confirmed')", "insert into Confirmations (user_id, time_stamp, action) values ('7', '2021-06-14 13:59:27', 'confirmed')", "insert into Confirmations (user_id, time_stamp, action) values ('2', '2021-01-22 00:00:00', 'confirmed')", "insert into Confirmations (user_id, time_stamp, action) values ('2', '2021-02-28 23:59:59', 'timeout')" ], "enableRunCode": true, "enableTestMode": false, "enableDebugger": false, "envInfo": "{\"mysql\": [\"MySQL\", \"
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