I have this below query which takes about 15-20 secs to run. with cte0 as ( SELECT label, date, CASE WHEN Lead(label || date || “number”) OVER (PARTITION BY label || date || “number” ORDER BY “label”, “date”, “number”, “time”) IS NULL THEN ‘1’::numeric ELSE ‘0’::numeric END As “unique” FROM table_data LEFT JOIN table_mapper ON table_mapper.”type” = table_data.”type” WHERE Date
Tag: query-optimization
Optimize a SQL query : call a function or do a join?
What is the fastest in an ORACLE database ? Call a function inside a select statement to retrive a single value for each row SELECT field1, field2, F_GET_LIBELLE_STATUT( field2 ) FROM table1 WHERE …..
Meaning of “Select tables optimized away” in MySQL Explain plan
What is the meaning of Select tables optimized away in MySQL Explain plan? explain select count(comment_count) from wp_posts; +—-+————-+—————————+———————…
Counting DISTINCT over multiple columns
Is there a better way of doing a query like this: SELECT COUNT(*) FROM (SELECT DISTINCT DocumentId, DocumentSessionId FROM DocumentOutputItems) AS internalQuery I need to count the number of …