CAST Empty Alias to Integer From Union Of 2 SQL in PostgreSQL












0















I have a SQL that running normally in MySQL. But since I was asked to change the database to PostgreSQL, the SQL cannot run normally. It's because datatype. Let's look the example:



SELECT A, B, C FROM tbl_first

  UNION ALL

SELECT D, ' ', F FROM tbl_second


Let's say column B have a datatype as Integer. When I run on PostgreSQL, the notice say "invalid input syntax for integer: LINE 3: ' ',". Maybe my guess is right, this is due to the definition of ' ' column.



I always use CAST(COLUMN AS INTEGER) method to cast a column which string or character datatype to Integer. But in my case it always give me an error.



How best way to solve this? Thank's.






postgresql







share|improve this question


















  • 1





    Why not use select d, null::integer, f from tbl_second instead?

    – a_horse_with_no_name
    Nov 22 '18 at 8:50













  • @a_horse_with_no_name thanks for the answer, your method is works too.

    – Ugy Astro
    Nov 22 '18 at 8:59
















0















I have a SQL that running normally in MySQL. But since I was asked to change the database to PostgreSQL, the SQL cannot run normally. It's because datatype. Let's look the example:



SELECT A, B, C FROM tbl_first

  UNION ALL

SELECT D, ' ', F FROM tbl_second


Let's say column B have a datatype as Integer. When I run on PostgreSQL, the notice say "invalid input syntax for integer: LINE 3: ' ',". Maybe my guess is right, this is due to the definition of ' ' column.



I always use CAST(COLUMN AS INTEGER) method to cast a column which string or character datatype to Integer. But in my case it always give me an error.



How best way to solve this? Thank's.






postgresql







share|improve this question


















  • 1





    Why not use select d, null::integer, f from tbl_second instead?

    – a_horse_with_no_name
    Nov 22 '18 at 8:50













  • @a_horse_with_no_name thanks for the answer, your method is works too.

    – Ugy Astro
    Nov 22 '18 at 8:59














0












0








0








I have a SQL that running normally in MySQL. But since I was asked to change the database to PostgreSQL, the SQL cannot run normally. It's because datatype. Let's look the example:



SELECT A, B, C FROM tbl_first

  UNION ALL

SELECT D, ' ', F FROM tbl_second


Let's say column B have a datatype as Integer. When I run on PostgreSQL, the notice say "invalid input syntax for integer: LINE 3: ' ',". Maybe my guess is right, this is due to the definition of ' ' column.



I always use CAST(COLUMN AS INTEGER) method to cast a column which string or character datatype to Integer. But in my case it always give me an error.



How best way to solve this? Thank's.






postgresql







share|improve this question














I have a SQL that running normally in MySQL. But since I was asked to change the database to PostgreSQL, the SQL cannot run normally. It's because datatype. Let's look the example:



SELECT A, B, C FROM tbl_first

  UNION ALL

SELECT D, ' ', F FROM tbl_second


Let's say column B have a datatype as Integer. When I run on PostgreSQL, the notice say "invalid input syntax for integer: LINE 3: ' ',". Maybe my guess is right, this is due to the definition of ' ' column.



I always use CAST(COLUMN AS INTEGER) method to cast a column which string or character datatype to Integer. But in my case it always give me an error.



How best way to solve this? Thank's.






postgresql




postgresql






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 22 '18 at 8:40









Ugy AstroUgy Astro

94112




94112








  • 1





    Why not use select d, null::integer, f from tbl_second instead?

    – a_horse_with_no_name
    Nov 22 '18 at 8:50













  • @a_horse_with_no_name thanks for the answer, your method is works too.

    – Ugy Astro
    Nov 22 '18 at 8:59














  • 1





    Why not use select d, null::integer, f from tbl_second instead?

    – a_horse_with_no_name
    Nov 22 '18 at 8:50













  • @a_horse_with_no_name thanks for the answer, your method is works too.

    – Ugy Astro
    Nov 22 '18 at 8:59








1




1





Why not use select d, null::integer, f from tbl_second instead?

– a_horse_with_no_name
Nov 22 '18 at 8:50







Why not use select d, null::integer, f from tbl_second instead?

– a_horse_with_no_name
Nov 22 '18 at 8:50















@a_horse_with_no_name thanks for the answer, your method is works too.

– Ugy Astro
Nov 22 '18 at 8:59





@a_horse_with_no_name thanks for the answer, your method is works too.

– Ugy Astro
Nov 22 '18 at 8:59












1 Answer
1






active

oldest

votes


















1














You need to cast column B to text:



SELECT A, B::text, C FROM tbl_first

UNION ALL

SELECT D, ' ', F FROM tbl_second


In a union query, all columns in the same position usually need to have the same type.






share|improve this answer
























  • Yes, union need all colums in the same type, I'm new about postgresql, and don't know how to cast. Thank's for the answer. It's work!

    – Ugy Astro
    Nov 22 '18 at 8:58











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














You need to cast column B to text:



SELECT A, B::text, C FROM tbl_first

UNION ALL

SELECT D, ' ', F FROM tbl_second


In a union query, all columns in the same position usually need to have the same type.






share|improve this answer
























  • Yes, union need all colums in the same type, I'm new about postgresql, and don't know how to cast. Thank's for the answer. It's work!

    – Ugy Astro
    Nov 22 '18 at 8:58
















1














You need to cast column B to text:



SELECT A, B::text, C FROM tbl_first

UNION ALL

SELECT D, ' ', F FROM tbl_second


In a union query, all columns in the same position usually need to have the same type.






share|improve this answer
























  • Yes, union need all colums in the same type, I'm new about postgresql, and don't know how to cast. Thank's for the answer. It's work!

    – Ugy Astro
    Nov 22 '18 at 8:58














1












1








1







You need to cast column B to text:



SELECT A, B::text, C FROM tbl_first

UNION ALL

SELECT D, ' ', F FROM tbl_second


In a union query, all columns in the same position usually need to have the same type.






share|improve this answer













You need to cast column B to text:



SELECT A, B::text, C FROM tbl_first

UNION ALL

SELECT D, ' ', F FROM tbl_second


In a union query, all columns in the same position usually need to have the same type.







share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 22 '18 at 8:43









Tim BiegeleisenTim Biegeleisen

228k1395147




228k1395147













  • Yes, union need all colums in the same type, I'm new about postgresql, and don't know how to cast. Thank's for the answer. It's work!

    – Ugy Astro
    Nov 22 '18 at 8:58



















  • Yes, union need all colums in the same type, I'm new about postgresql, and don't know how to cast. Thank's for the answer. It's work!

    – Ugy Astro
    Nov 22 '18 at 8:58

















Yes, union need all colums in the same type, I'm new about postgresql, and don't know how to cast. Thank's for the answer. It's work!

– Ugy Astro
Nov 22 '18 at 8:58





Yes, union need all colums in the same type, I'm new about postgresql, and don't know how to cast. Thank's for the answer. It's work!

– Ugy Astro
Nov 22 '18 at 8:58




















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