Postgresql if null THEN 0
If the ELSE clause is omitted and no condition is true, the result is null. An example: ... SELECT ... WHERE CASE WHEN x <> 0 THEN y/x > 1.5 ELSE false END;. ,If the ELSE clause is omitted and no condition is true, the result is null. An example: ... SELECT ... WHERE CASE WHEN x <> 0 THEN y/x > 1.5 ELSE false END;. ,If the expression is NULL, then the ISNULL function returns the replacement . Otherwise, it returns the result of the expression . PostgreSQL does not have the ... ,MySQL has IFNULL function, while Oracle provides NVL function. ... In the query above we say if the discount is null then use zero (0) otherwise use discount ... ,The NULLIF function returns a null value if argument_1 equals to argument_2 ... SELECT (SUM ( CASE WHEN gender = 1 THEN 1 ELSE 0 END ) / SUM ( CASE ... ,Now, should the NULL row in the table be counted as 0? Then coalesce has to be used inside the avg call. $ select coalesce(avg(coalesce(bar, 0)), 0) from foo; ... ,Use max(coalesce(logincount, 0)) to avoid NULLs. According to Postgres docs (9.6): The COALESCE function returns the first of its arguments that is not null. , When I execute select max(column) from mytable;. and my table has no rows, it returns null. How can I amend this select statement so it will ...
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 Postgresql if null THEN 0 相關參考資料
Documentation: 9.0: Conditional Expressions - PostgreSQL
If the ELSE clause is omitted and no condition is true, the result is null. An example: ... SELECT ... WHERE CASE WHEN x <> 0 THEN y/x > 1.5 ELSE false END;. https://www.postgresql.org Documentation: 9.2: Conditional Expressions - PostgreSQL
If the ELSE clause is omitted and no condition is true, the result is null. An example: ... SELECT ... WHERE CASE WHEN x <> 0 THEN y/x > 1.5 ELSE false END;. https://www.postgresql.org Looking for PostgreSQL ISNULL? Use COALESCE Function ...
If the expression is NULL, then the ISNULL function returns the replacement . Otherwise, it returns the result of the expression . PostgreSQL does not have the ... https://www.postgresqltutorial PostgreSQL COALESCE - PostgreSQL Tutorial
MySQL has IFNULL function, while Oracle provides NVL function. ... In the query above we say if the discount is null then use zero (0) otherwise use discount ... https://www.postgresqltutorial PostgreSQL NULLIF function - PostgreSQL Tutorial
The NULLIF function returns a null value if argument_1 equals to argument_2 ... SELECT (SUM ( CASE WHEN gender = 1 THEN 1 ELSE 0 END ) / SUM ( CASE ... https://www.postgresqltutorial postgresql return 0 if returned value is null - Stack Overflow
Now, should the NULL row in the table be counted as 0? Then coalesce has to be used inside the avg call. $ select coalesce(avg(coalesce(bar, 0)), 0) from foo; ... https://stackoverflow.com Postgresql To Return 0 when Null - DBA Stack Exchange
Use max(coalesce(logincount, 0)) to avoid NULLs. According to Postgres docs (9.6): The COALESCE function returns the first of its arguments that is not null. https://dba.stackexchange.com Postgresql turn null into zero - Stack Overflow
When I execute select max(column) from mytable;. and my table has no rows, it returns null. How can I amend this select statement so it will ... https://stackoverflow.com |