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 |
| --- | --- | --- | --- | --- | --- |
| Texas 1 | Jim Chapman | Democratic | 1985.0 | Re-elected | Jim Chapman (D) Unopposed |
| Texas 4 | Ralph Hall | Democratic | 1980.0 | Re-elected | Ralph Hall (D) 71.7% Thomas Blow (R) 28.3% |
| Texas 6 | Joe Barton | Republican | 1984.0 | Re-elected | Joe Barton (R) 55.8% Pete Geren (D) 44.2% |
| Texas 8 | Jack Fields | Republican | 1980.0 | Re-elected | Jack Fields (R) 68.4% Blaine Mann (D) 31.6% |
| Texas 9 | Jack Brooks | Democratic | 1952.0 | Re-elected | Jack Brooks (D) 61.5% Lisa D. Duperier (R) 38.5% |
| Texas 11 | Marvin Leath | Democratic | 1978.0 | Re-elected | Marvin Leath (D) Unopposed |
| Texas 12 | Jim Wright | Democratic | 1954.0 | Re-elected | Jim Wright (D) 68.7% Don McNeil (R) 31.3% |
| Texas 13 | Beau Boulter | Republican | 1984.0 | Re-elected | Beau Boulter (R) 64.9% Doug Seal (D) 35.1% |
| Texas 14 | Mac Sweeney | Republican | 1984.0 | Re-elected | Mac Sweeney (R) 52.3% Greg Laughlin (D) 47.7% |
| Texas 15 | Kika de la Garza | Democratic | 1964.0 | Re-elected | Kika de la Garza (D) Unopposed |
| Texas 16 | Ronald D. Coleman | Democratic | 1982.0 | Re-elected | Ronald D. Coleman (D) 65.7% Roy Gillia (R) 34.3% |
| Texas 17 | Charles Stenholm | Democratic | 1978.0 | Re-elected | Charles Stenholm (D) Unopposed |
| Texas 18 | Mickey Leland | Democratic | 1978.0 | Re-elected | Mickey Leland (D) 90.2% Joanne Kuniansky (I) 9.8% |
| Texas 19 | Larry Combest | Republican | 1984.0 | Re-elected | Larry Combest (R) 62.0% Gerald McCathern (D) 38.0% |
| Texas 20 | Henry B. Gonzalez | Democratic | 1961.0 | Re-elected | Henry B. Gonzalez (D) Unopposed |
| Texas 22 | Tom DeLay | Republican | 1984.0 | Re-elected | Tom DeLay (R) 71.8% Susan Director (D) 28.2% |
| Texas 23 | Albert Bustamante | Democratic | 1984.0 | Re-elected | Albert Bustamante (D) 90.7% Ken Hendrix ( L ) 9.3% |
| Texas 24 | Martin Frost | Democratic | 1978.0 | Re-elected | Martin Frost (D) 67.2% Bob Burk (R) 32.8% |
| Texas 25 | Michael A. Andrews | Democratic | 1982.0 | Re-elected | Michael A. Andrews (D) Unopposed |
| Texas 26 | Dick Armey | Republican | 1984.0 | Re-elected | Dick Armey (R) 68.1% George Richardson (D) 31.9% |
Question:
How many districts have Mac Sweeney as incumbent?
Answer:
1.0