Teradata 如果含有FORMAT参数的case语句未用半角括号“()”括起来，该语句不会处理。 例如： 1 case when column1='0' then column1='value' end (FORMAT 'YYYYMMDD')as alias1 在该示例中，case when column1='0' then column1='value' end未用半角括号括起，因此不会处理该语句。

系统视图 DSC将系统视图dbc.columnsV和dbc.IndicesV进行迁移，输出如下结果。 输入： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 SELECT A.ColumnName AS V_COLS ,A.columnname || ' ' ||CASE WHEN columnType in ('CF','CV') THEN CASE WHEN columnType='CV' THEN 'VAR' ELSE '' END||'CHAR('||TRIM(columnlength (INT))|| ') CHARACTER SET LATIN'|| CASE WHEN UpperCaseFlag='N' THEN ' NOT' ELSE '' END || ' CASESPECIFIC' WHEN columnType='DA' THEN 'DATE' WHEN columnType='TS' THEN 'TIMESTAMP(' || TRIM(DecimalFractionalDigits)||')' WHEN columnType='AT' THEN 'TIME('|| TRIM(DecimalFractionalDigits)||')' WHEN columnType='I' THEN 'INTEGER' WHEN columnType='I1' THEN 'BYTEINT' WHEN columnType='I2' THEN 'SMALLINT' WHEN columnType='I8' THEN 'BIGINT' WHEN columnType='D' THEN 'DECIMAL('||TRIM(DecimalTotalDigits)||','||TRIM(DecimalFractionalDigits)||')' ELSE 'Unknown' END||CASE WHEN Nullable='Y' THEN '' ELSE ' NOT NULL' END||'0A'XC AS V_ColT - ,B.ColumnName AS V_PICol FROM dbc.columnsV A LEFT JOIN dbc.IndicesV B ON A.columnName = B.columnName AND B.IndexType IN ('Q','P') AND B.DatabaseName = '${V_TDDLDB}' AND B.tablename='${TARGET_TABLE}' WHERE A.databasename='${V_TDDLDB}' AND A.tablename = '${TARGET_TABLE}' AND A.columnname NOT IN ( 'ETL_JOB_NAME' ,'ETL_TX_DATE' ,'ETL_PROC_DATE' ) ORDER BY A.columnid; 输出： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 DECLARE lv_mig_V_COLS TEXT; lv_mig_V_ColT TEXT; lv_mig_V_PICol TEXT; BEGIN SELECT STRING_AGG(A.ColumnName, ',') , STRING_AGG(A.columnname || ' ' ||CASE WHEN columnType in ('CF','CV') THEN CASE WHEN columnType='CV' THEN 'VAR' ELSE '' END||'CHAR('||TRIM(mig_td_ext.mig_fn_castasint(columnlength))|| ') /*CHARACTER SET LATIN*/'|| CASE WHEN UpperCaseFlag='N' THEN ' NOT' ELSE '' END || ' /*CASESPECIFIC*/' WHEN columnType='DA' THEN 'DATE' WHEN columnType='TS' THEN 'TIMESTAMP(' || TRIM(DecimalFractionalDigits)||')' WHEN columnType='AT' THEN 'TIME('|| TRIM(DecimalFractionalDigits)||')' WHEN columnType='I' THEN 'INTEGER' WHEN columnType='I1' THEN 'BYTEINT' WHEN columnType='I2' THEN 'SMALLINT' WHEN columnType='I8' THEN 'BIGINT' WHEN columnType='D' THEN 'DECIMAL('||TRIM(DecimalTotalDigits)||','||TRIM(DecimalFractionalDigits)||')' ELSE 'Unknown' END||CASE WHEN Nullable='Y' THEN '' ELSE ' NOT NULL' END||E'\x0A', ',') , STRING_AGG(B.ColumnName, ',') INTO lv_mig_V_COLS, lv_mig_V_ColT, lv_mig_V_PICol FROM mig_td_ext.vw_td_dbc_columnsV A LEFT JOIN mig_td_ext.vw_td_dbc_IndicesV B ON A.columnName = B.columnName AND B.IndexType IN ('Q','P') AND B.DatabaseName = 'public' AND B.tablename='emp2' WHERE A.databasename='public' AND A.tablename = 'emp2'; -- ORDER BY A.columnid; END; / 父主题： Teradata语法迁移