SELECT listagg(concat('SUM(CASE WHEN course = ''', course, ''' THEN score ELSE 0 END) AS "', course,'"'),',') WITHIN GROUP(ORDER BY 1) AS concat_text FROM (SELECT DISTINCT course FROM grade);
SUM(CASE WHEN course = '数学' THEN score ELSE 0 END) AS "数学",SUM(CASE WHEN course = '英语' THEN score ELSE 0 END) AS "英语",SUM(CASE WHEN course = '语文' THEN score ELSE 0 END) AS "语文"
CREATE OR REPLACE FUNCTION fun_test()
s_sql := 'SELECT listagg(CONCAT(''SUM(CASE WHEN course = '''''', course, '''''' THEN score ELSE 0 END) AS "'', course, ''"'' ),'','' ) WITHIN GROUP(ORDER BY 1) AS concat_text FROM (SELECT DISTINCT course FROM grade);';
s_sql := 'DROP VIEW IF EXISTS v_score; CREATE VIEW v_score AS SELECT name, ' || rec.concat_text || ' FROM grade GROUP BY name;';
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