How can I use a default value in a Select query in PostgreSQL
5 Answers Sorted by 66 SELECT coalesce MAX post id 0 AS max id FROM my table WHERE org id 3 or SELECT case count when 0 then 0 else MAX post id end AS max id FROM my table WHERE org id 3 if you want max post id to be null when there is 1 row but post id is null dbfiddle Share Improve this answer Follow edited Mar 1 2017 at 13 50
Sql postgresql return 0 if returned value is null Stack Overflow, 1 It is Ok to use a having clause without a group by which defaults to a single group It acts as a where clause on aggregate results In this case the rows are only returned if more than 5 rows are returned by the 1st level subquery bruceskyaus Aug 22 2019 at 1 32
PostgreSQL Documentation 16 5 2 Default Values
The default value can be an expression which will be evaluated whenever the default value is inserted not when the table is created A common example is for a timestamp column to have a default of CURRENT TIMESTAMP so that it gets set to the time of row insertion Another common example is generating a serial number for each row
PostgreSQL select with default value Yuval Baror s Blog, The straightforward solution is to use a CASE statement in the SELECT query like this SELECT CASE WHEN SELECT count FROM my table WHERE my field my value 0 THEN my value field ELSE my default value END FROM my table WHERE my field my value However this straightforward solution is not efficient
Postgresql Select default value from not null column if WHERE
Postgresql Select default value from not null column if WHERE , 1 For example I have 3 NOT NULL columns in t shops id name locale Locale column has default value as empty string I need to select default value if where statement doesnt match I was trying with COALESCE function but it works only for NULL columns I have PostgreSQL DB
Postgresql Postgres ALTER TABLE ADD CONSTRAINT IF NOT EXISTS Not
Set null values to a default in Postgresql case statement
Set null values to a default in Postgresql case statement To check if an expression evaluates to NULL IS NULL is used So you could use a searched CASE expression CASE WHEN categories rental price percentage IS NULL THEN 15 0 ELSE categories rental price percentage END rental But replacing NULL s is such a common task that there exists a function to do that coalesce
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NULLIF value1 value2 The NULLIF function returns a null value if value1 equals value2 otherwise it returns value1 This can be used to perform the inverse operation of the COALESCE example given above SELECT NULLIF value none In this example if value is none null is returned otherwise the value of value is returned The two arguments must be of comparable types PostgreSQL Documentation 16 9 18 Conditional Expressions. Both columns will set NULL if column a is not specified As far as I know if I add a column into a table with a default value in production database it could lead to trouble rewriting all rows with default value Is DEFAULT NULL the same postgresql datatypes postgresql 9 6 default value Share Improve this ion Follow Select the DEFAULT value from the information schema and use it in the COALESCE expression I m no expert but it seems like there should be a simpler and more elegant way to do it Use INSERT and then UPDATE Like this
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