从另一个表插入数据作为外键

Question

There are two tables.

Table 1

           expenseID | description | generatedBy | notifyWho | frequencyGeneration
              1      | Advance Pay | Conductor   | Clerk     | Once a week
              2      | Contract Pay| Conductor   | Clerk     | Contract Period

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Table 2

       divExpenseID |   divNo     | expenseID   |descriptions| date       | amount   | status
              1     |     1       |   1         | Clerk      | 2020-01-11 | 5000     | Pending
              2     |     1       |   1         | Clerk      | 2020-01-11 | 2000     | Active

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In this, I entered data to table 1 first, then I inserted data to table 2 except expenseID in table 2. I want to get data for expenseID using table 1.

As an example, when I insert data to divExpenseID, divNo, descriptions, date, amount, status expenseID should be updated automatically from table 1.

What is the query for that, is it better if I write only one query for above operation.

Answer 1

The table 1 description tells that expenseID data type is char, but the datas you stored in expenseID are number.

I suggest you change the data type of expenseID to integer and use the AUTO_INCREMENT machanism for this field.

After each the insertion of table 1 is completted then you can get the AUTO_INCREMENT id of the last row that has been inserted or updated in a table 1 by using

SELECT LAST_INSERT_ID();