I have a table called bom10500 that looks like the first table below. What kind of query can I create from this table that gives me a fifth column called "top level" as shown in the second table below? I am not sure what kind of TSQL query that will give me this...
| Part | Component | Group | Sub Unit | |
| 878-00 | 878-01 | A | 1 | |
| 878-00 | 878-02 | A | 0 | |
| 878-00 | 878-03 | A | 0 | |
| 878-00 | 878-04 | A | 0 | |
| 878-00 | 878-05 | B | 1 | |
| 878-00 | 878-06 | B | 0 | |
| 878-00 | 878-07 | C | 1 | |
| 878-00 | 878-08 | C | 0 | |
| 878-00 | 878-09 | C | 0 | |
| Part | Component | Group | Sub Unit | Top Level |
| 878-00 | 878-01 | A | 1 | 878-01 |
| 878-00 | 878-02 | A | 0 | 878-01 |
| 878-00 | 878-03 | A | 0 | 878-01 |
| 878-00 | 878-04 | A | 0 | 878-01 |
| 878-00 | 878-05 | B | 1 | 878-05 |
| 878-00 | 878-06 | B | 0 | 878-05 |
| 878-00 | 878-07 | C | 1 | 878-07 |
| 878-00 | 878-08 | C | 0 | 878-07 |
| 878-00 | 878-09 | C | 0 | 878-07 |
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