Task: NL2SQL (source dataset: WikiSQL)

Natural language to SQL, also known as NL2SQL, is the problem of generating a SQL query that can be executed on a input table, for a given natural language question.

You will be given an input table called "table" in the markdown format, as well as a question. Your task is to generate an SQL query that can be executed on the input table to answer the question.

Please ensure that the generated SQL only return relevant columns being specifically asked in the question (e.g., in SQL please don't return more than one columns in SELECT if only one column is needed to answer the given question, and similarly please refrain from using SELECT * unless the entire row is needed to answer the question).
 
When generating SQL code, please use the SQLite syntax to ensure that your SQL is executable on SQLite3. Use only columns that are present in the table, always use quotes around your column and table names (some column names have punctuation or special characters), and refer to the columns using the column-names exactly as they appear in the table, do not add or remove punctuation (underscore, slash, etc.)

No explanation, return the code only with the following markdown codeblock format : ```sql<SQL CODE>```. For example, ```sql
SELECT * FROM "table"
``` is a valid format.

Table:
| Episode    | First aired       | Entrepreneur(s)                                    | Company or product name             |   Money requested (£) | Investing Dragon(s)               |
|:-----------|:------------------|:---------------------------------------------------|:------------------------------------|----------------------:|:----------------------------------|
| episode 1  | 31 july 2011      | georgette hewitt                                   | the present club                    |                 60000 | peter jones and theo paphitis     |
| episode 1  | 31 july 2011      | chris hopkins                                      | ploughcroft solar                   |                120000 | deborah meaden and theo paphitis  |
| episode 2  | 7 august 2011     | christian hartmann, martin mclaughlin, tom callard | love da pop                         |                 70000 | peter jones                       |
| episode 2  | 7 august 2011     | liz and alan colleran                              | raskelf memory foam (duvalay)       |                 80000 | hilary devey                      |
| episode 3  | 14 august 2011    | peter and michelle hart                            | fun fancy dress                     |                100000 | duncan bannatyne                  |
| episode 4  | 21 august 2011    | bob davis                                          | unique ideas uk                     |                 50000 | hilary devey                      |
| episode 4  | 21 august 2011    | robert lewis                                       | rollersigns                         |                100000 | peter jones                       |
| episode 5  | 28 august 2011    | kate castle                                        | boginabag                           |                 50000 | theo paphitis                     |
| episode 5  | 28 august 2011    | henry buckley and jj harding                       | jogpost limited                     |                 50000 | deborah meaden                    |
| episode 6  | 4 september 2011  | andy bates                                         | ab performance                      |                 50000 | peter jones                       |
| episode 7  | 12 september 2011 | nick cross, richard hadden and sebastian stoddart  | barmate                             |                 50000 | deborah meaden and theo paphitis  |
| episode 7  | 12 september 2011 | simon booth                                        | kiddimoto                           |                 75000 | hilary devey and duncan bannatyne |
| episode 8  | 19 september 2011 | ryan ashmore and liam webb                         | rka records                         |                 50000 | duncan bannatyne                  |
| episode 8  | 19 september 2011 | aidan quinn and gemma roe                          | ecohab homes and o-pod buildings    |                 75000 | theo paphitis                     |
| episode 9  | 26 september 2011 | andrea mcdowall and rebecca baldwin                | shoot it yourself                   |                 60000 | hilary devey                      |
| episode 10 | 3 october 2011    | helen waterston                                    | innovative gadgets ltd. (roastcosy) |                 70000 | peter jones and deborah meaden    |

Question: how much money was requested on the show which aired on 4 september 2011?

table_id: 2-12617978-13
label: SELECT SUM("Money requested (£)") FROM "table" WHERE "First aired" = "4 september 2011"