```json { "action": "tool_call", "reasoning": "Need to profile all columns in raw.ae to identify which have missing values. I'll write a single comprehensive query that calculates null counts and percentages for all 39 columns using aggregates in one SELECT statement.", "tool": "query_sql", "sql": "SELECT COUNT(*) as total_rows, COUNT(*) - COUNT(STUDYID) as studyid_nulls, COUNT(*) - COUNT(DOMAIN) as domain_nulls, COUNT(*) - COUNT(USUBJID) as usubjid_nulls, COUNT(*) - COUNT(AESEQ) as aeseq_nulls, COUNT(*) - COUNT(AESPID) as aespid_nulls, COUNT(*) - COUNT(AETERM) as aeterm_nulls, COUNT(*) - COUNT(AELLT) as aellt_nulls, COUNT(*) - COUNT(AELLTCD) as aelltcd_nulls, COUNT(*) - COUNT(AEDECOD) as aedecod_nulls, COUNT(*) - COUNT(AEPTCD) as aeptcd_nulls, COUNT(*) - COUNT(AEHLT) as aehlt_nulls, COUNT(*) - COUNT(AEHLTCD) as aehltcd_nulls, COUNT(*) - COUNT(AEHLGT) as aehlgt_nulls, COUNT(*) - COUNT(AEHLGTCD) as aehlgtcd_nulls, COUNT(*) - COUNT(AEBODSYS) as aebodsys_nulls, COUNT(*) - COUNT(AEBDSYCD) as aebdsycd_nulls, COUNT(*) - COUNT(AESOC) as aesoc_nulls, COUNT(*) - COUNT(AESOCCD) as aesoccd_nulls, COUNT(*) - COUNT(AESEV) as aesev_nulls, COUNT(*) - COUNT(AESER) as aeser_nulls, COUNT(*) - COUNT(AEACN) as aeacn_nulls, COUNT(*) - COUNT(AEREL) as aerel_nulls, COUNT(*) - COUNT(AEOUT) as aeout_nulls, COUNT(*) - COUNT(AESCAN) as aescan_nulls, COUNT(*) - COUNT(AESCONG) as aescong_nulls, COUNT(*) - COUNT(AESDISAB) as aesdisab_nulls, COUNT(*) - COUNT(AESDTH) as aesdth_nulls, COUNT(*) - COUNT(AESHOSP) as aeshosp_nulls, COUNT(*) - COUNT(AESLIFE) as aeslife_nulls, COUNT(*) - COUNT(AESOD) as aesod_nulls, COUNT(*) - COUNT(AEDTC) as aedtc_nulls, COUNT(*) - COUNT(AESTDTC) as aestdtc_nulls, COUNT(*) - COUNT(AEENDTC) as aeendtc_nulls, COUNT(*) - COUNT(AESTDY) as aestdy_nulls, COUNT(*) - COUNT(AEENDY) as aeendy_nulls FROM raw.ae", "purpose": "Calculate null counts for all columns in raw.ae to identify which columns have missing values", "source": "raw" } ```