Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| District | Incumbent | Party | First elected | Result | Candidates |
| --- | --- | --- | --- | --- | --- |
| Alabama 1 | John McDuffie | Democratic | 1918.0 | Re-elected | John McDuffie (D) Unopposed |
| Alabama 2 | J. Lister Hill | Democratic | 1923.0 | Re-elected | J. Lister Hill (D) Unopposed |
| Alabama 3 | Henry B. Steagall | Democratic | 1914.0 | Re-elected | Henry B. Steagall (D) Unopposed |
| Alabama 4 | Lamar Jeffers | Democratic | 1921.0 | Re-elected | Lamar Jeffers (D) 68.5% E. D. Banks (R) 31.5% |
| Alabama 5 | Lafayette L. Patterson | Democratic | 1928.0 | Re-elected | Lafayette L. Patterson (D) Unopposed |
| Alabama 6 | William B. Oliver | Democratic | 1914.0 | Re-elected | William B. Oliver (D) Unopposed |
Question:
How many districts does william b. oliver represent?
Answer:
1.0