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Commit 81e5b16

Browse files
feat: add sql solutions to lc problems (doocs#1121)
* No.1990.Count the Number of Experiments * No.2020.Number of Accounts That Did Not Stream * No.2051.The Category of Each Member in the Store * No.2066.Account Balance * No.2084.Drop Type 1 Orders for Customers With Type 0 Orders * No.2112.The Airport With the Most Traffic
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‎.prettierrc‎

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"solution/1600-1699/1667.Fix Names in a Table/Solution.sql",
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"solution/1700-1799/1777.Product's Price for Each Store/Solution.sql",
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"solution/1900-1999/1972.First and Last Call On the Same Day/Solution.sql",
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"solution/2000-2099/2066.Account Balance/Solution.sql",
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"solution/2600-2699/2686.Immediate Food Delivery III/Solution.sql",
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"solution/2700-2799/2752.Customers with Maximum Number of Transactions on Consecutive Days/Solution.sql"
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],

‎solution/0100-0199/0192.Word Frequency/README.md‎

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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```sh
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# Read from the file words.txt and output the word frequency list to stdout.
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cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -nr | awk '{print 2,ドル 1ドル}'
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```
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<!-- tabs:end -->

‎solution/0100-0199/0192.Word Frequency/README_EN.md‎

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### **Bash**
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```sh
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# Read from the file words.txt and output the word frequency list to stdout.
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cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -nr | awk '{print 2,ドル 1ドル}'
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```
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<!-- tabs:end -->
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#!/usr/bin/env bash
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# NF是当前行的field字段数;NR是正在处理的当前行数。
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awk '{
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for(i=1;i<=NF;i++){
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res[$i]++
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}
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}
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END{
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for(k in res){
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print k,res[k]
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}
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}' words.txt | sort -nr -k2
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#or:
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cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -r | awk '{print 2ドル" "1ドル}'
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# Read from the file words.txt and output the word frequency list to stdout.
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cat words.txt | tr -s ' ' '\n' | sort | uniq -c | sort -nr | awk '{print 2,ドル 1ドル}'

‎solution/1900-1999/1990.Count the Number of Experiments/README.md‎

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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```sql
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# Write your MySQL query statement below
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WITH
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P AS (
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SELECT 'Android' AS platform
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UNION
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SELECT 'IOS'
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UNION
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SELECT 'Web'
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),
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Exp AS (
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SELECT 'Reading' AS experiment_name
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UNION
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SELECT 'Sports'
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UNION
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SELECT 'Programming'
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),
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T AS (
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SELECT *
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FROM
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P,
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Exp
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)
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SELECT platform, experiment_name, count(experiment_id) AS num_experiments
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FROM
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T AS t
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LEFT JOIN Experiments USING (platform, experiment_name)
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GROUP BY 1, 2;
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```
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<!-- tabs:end -->

‎solution/1900-1999/1990.Count the Number of Experiments/README_EN.md‎

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### **SQL**
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```sql
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# Write your MySQL query statement below
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WITH
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P AS (
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SELECT 'Android' AS platform
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UNION
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SELECT 'IOS'
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UNION
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SELECT 'Web'
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),
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Exp AS (
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SELECT 'Reading' AS experiment_name
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UNION
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SELECT 'Sports'
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UNION
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SELECT 'Programming'
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),
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T AS (
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SELECT *
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FROM
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P,
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Exp
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)
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SELECT platform, experiment_name, count(experiment_id) AS num_experiments
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FROM
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T AS t
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LEFT JOIN Experiments USING (platform, experiment_name)
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GROUP BY 1, 2;
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```
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<!-- tabs:end -->
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# Write your MySQL query statement below
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WITH
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P AS (
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SELECT 'Android' AS platform
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UNION
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SELECT 'IOS'
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UNION
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SELECT 'Web'
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),
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Exp AS (
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SELECT 'Reading' AS experiment_name
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UNION
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SELECT 'Sports'
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UNION
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SELECT 'Programming'
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),
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T AS (
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SELECT *
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FROM
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P,
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Exp
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)
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SELECT platform, experiment_name, count(experiment_id) AS num_experiments
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FROM
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T AS t
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LEFT JOIN Experiments USING (platform, experiment_name)
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GROUP BY 1, 2;

‎solution/2000-2099/2020.Number of Accounts That Did Not Stream/README.md‎

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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```sql
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# Write your MySQL query statement below
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SELECT count(DISTINCT sub.account_id) AS accounts_count
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FROM
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Subscriptions AS sub
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LEFT JOIN Streams AS ss ON sub.account_id = ss.account_id
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WHERE
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year(start_date) <= 2021
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AND year(end_date) >= 2021
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AND (year(stream_date) != 2021 OR stream_date > end_date);
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```
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<!-- tabs:end -->

‎solution/2000-2099/2020.Number of Accounts That Did Not Stream/README_EN.md‎

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### **SQL**
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```sql
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# Write your MySQL query statement below
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SELECT count(DISTINCT sub.account_id) AS accounts_count
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FROM
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Subscriptions AS sub
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LEFT JOIN Streams AS ss ON sub.account_id = ss.account_id
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WHERE
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year(start_date) <= 2021
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AND year(end_date) >= 2021
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AND (year(stream_date) != 2021 OR stream_date > end_date);
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```
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<!-- tabs:end -->
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# Write your MySQL query statement below
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SELECT count(DISTINCT sub.account_id) AS accounts_count
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FROM
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Subscriptions AS sub
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LEFT JOIN Streams AS ss ON sub.account_id = ss.account_id
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WHERE
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year(start_date) <= 2021
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AND year(end_date) >= 2021
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AND (year(stream_date) != 2021 OR stream_date > end_date);

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