Table: us_congress_elections
Columns: district
incumbent
party
first_elected
result
candidates

Question:  how many result with candidates being richard j. welch (r) unopposed
SQL: SELECT COUNT("result") FROM us_congress_elections WHERE "candidates" = 'Richard J. Welch (R) Unopposed'

Question: what's the result with incumbent being jack z. anderson
SQL: SELECT "result" FROM us_congress_elections WHERE "incumbent" = 'Jack Z. Anderson'

Question: what's the district with result being re-elected and candidates being clarence f. lea (d) unopposed
SQL: SELECT "district" FROM us_congress_elections WHERE "result" = 'Re-elected' AND "candidates" = 'Clarence F. Lea (D) Unopposed'

Question: what's the first elected with incumbent being clair engle
SQL: SELECT "first_elected" FROM us_congress_elections WHERE "incumbent" = 'Clair Engle'

Question: who is the the candidates with incumbent being alfred j. elliott
SQL: SELECT "candidates" FROM us_congress_elections WHERE "incumbent" = 'Alfred J. Elliott'

Question: who is the the incumbent with candidates being jack z. anderson (r) unopposed
SQL: SELECT "incumbent" FROM us_congress_elections WHERE "candidates" = 'Jack Z. Anderson (R) Unopposed'