{
    "action": "tool_call",
    "reasoning": "I need to compute null/missing percentages for all columns in both tables. I'll write a single SQL query that profiles all columns across both tables using COUNT(*) and COUNT(column) to calculate missing percentages efficiently.",
    "tool": "query_sql",
    "args": {
        "sql": "WITH adsl_nulls AS (SELECT 'adsl' as table_name, 'STUDYID' as column_name, COUNT(*) as total_rows, COUNT(STUDYID) as non_null_count FROM raw.adsl UNION ALL SELECT 'adsl', 'USUBJID', COUNT(*), COUNT(USUBJID) FROM raw.adsl UNION ALL SELECT 'adsl', 'SUBJID', COUNT(*), COUNT(SUBJID) FROM raw.adsl UNION ALL SELECT 'adsl', 'RFSTDTC', COUNT(*), COUNT(RFSTDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'RFENDTC', COUNT(*), COUNT(RFENDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'RFXSTDTC', COUNT(*), COUNT(RFXSTDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'RFXENDTC', COUNT(*), COUNT(RFXENDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'RFICDTC', COUNT(*), COUNT(RFICDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'RFPENDTC', COUNT(*), COUNT(RFPENDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'DTHDTC', COUNT(*), COUNT(DTHDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'DTHFL', COUNT(*), COUNT(DTHFL) FROM raw.adsl UNION ALL SELECT 'adsl', 'SITEID', COUNT(*), COUNT(SITEID) FROM raw.adsl UNION ALL SELECT 'adsl', 'AGE', COUNT(*), COUNT(AGE) FROM raw.adsl UNION ALL SELECT 'adsl', 'AGEU', COUNT(*), COUNT(AGEU) FROM raw.adsl UNION ALL SELECT 'adsl', 'SEX', COUNT(*), COUNT(SEX) FROM raw.adsl UNION ALL SELECT 'adsl', 'RACE', COUNT(*), COUNT(RACE) FROM raw.adsl UNION ALL SELECT 'adsl', 'ETHNIC', COUNT(*), COUNT(ETHNIC) FROM raw.adsl UNION ALL SELECT 'adsl', 'ARMCD', COUNT(*), COUNT(ARMCD) FROM raw.adsl UNION ALL SELECT 'adsl', 'ARM', COUNT(*), COUNT(ARM) FROM raw.adsl UNION ALL SELECT 'adsl', 'ACTARMCD', COUNT(*), COUNT(ACTARMCD) FROM raw.adsl UNION ALL SELECT 'adsl', 'ACTARM', COUNT(*), COUNT(ACTARM) FROM raw.adsl UNION ALL SELECT 'adsl', 'COUNTRY', COUNT(*), COUNT(COUNTRY) FROM raw.adsl UNION ALL SELECT 'adsl', 'DMDTC', COUNT(*), COUNT(DMDTC) FROM raw.adsl UNION ALL SELECT 'adsl', 'DMDY', COUNT(*), COUNT(DMDY) FROM raw.adsl UNION ALL SELECT 'adsl', 'TRT01P', COUNT(*), COUNT(TRT01P) FROM raw.adsl UNION ALL SELECT 'adsl', 'TRT01A', COUNT(*), COUNT(TRT01A) FROM raw.adsl UNION ALL SELECT 'adsl', 'TRTSDTM', COUNT(*), COUNT(TRTSDTM) FROM raw.adsl UNION ALL SELECT 'adsl', 'TRTSDT', COUNT(*), COUNT(TRTSDT) FROM raw.adsl UNION ALL SELECT 'adsl', 'TRTEDTM', COUNT(*), COUNT(TRTEDTM) FROM raw.adsl UNION ALL SELECT 'adsl', 'TRTEDT', COUNT(*), COUNT(TRTEDT) FROM raw.adsl), ae_nulls AS (SELECT 'ae' as table_name, 'STUDYID' as column_name, COUNT(*) as total_rows, COUNT(STUDYID) as non_null_count FROM raw.ae UNION ALL SELECT 'ae', 'USUBJID', COUNT(*), COUNT(USUBJID) FROM raw.ae UNION ALL SELECT 'ae', 'AESEQ', COUNT(*), COUNT(AESEQ) FROM raw.ae UNION ALL SELECT 'ae', 'AETERM', COUNT(*), COUNT(AETERM) FROM raw.ae UNION ALL SELECT 'ae', 'AEDECOD', COUNT(*), COUNT(AEDECOD) FROM raw.ae UNION ALL SELECT 'ae', 'AEBODSYS', COUNT(*), COUNT(AEBODSYS) FROM raw.ae UNION ALL SELECT 'ae', 'AESEV', COUNT(*), COUNT(AESEV) FROM raw.ae UNION ALL SELECT 'ae', 'AESER', COUNT(*), COUNT(AESER) FROM raw.ae UNION ALL SELECT 'ae', 'AEREL', COUNT(*), COUNT(AEREL) FROM raw.ae UNION ALL SELECT 'ae', 'AEACN', COUNT(*), COUNT(AEACN) FROM raw.ae UNION ALL SELECT 'ae', 'AEOUT', COUNT(*), COUNT(AEOUT) FROM raw.ae UNION ALL SELECT 'ae', 'AESTDTC', COUNT(*), COUNT(AESTDTC) FROM raw.ae UNION ALL SELECT 'ae', 'AEENDTC', COUNT(*), COUNT(AEENDTC) FROM raw.ae) SELECT table_name, column_name, total_rows, non_null_count, total_rows - non_null_count as null_count, ROUND(100.0 * (total_rows - non_null_count) / total_rows, 2) as null_percentage FROM (SELECT * FROM adsl_nulls UNION ALL SELECT * FROM ae_nulls) WHERE null_count > 0 ORDER BY null_percentage DESC",
        "purpose": "Calculate missing value percentages for all columns in both adsl and ae tables",
        "source": "raw"
    }
}