Combine Queries using Union All Dynamically
I have three tables:
Table A Table B Table C
______________ ______________ ______________
| Order | Year | | Order | Year | | Order | Year |
+--------------+ +--------------+ +--------------+
| O1-17 | 2017 | | O1-18 | 2018 | | O1-19 | 2019 |
+--------------+ +--------------+ +--------------+
I combined those tables using UNION ALL.
SELECT Order,Year FROM [Table A]
UNION ALL
SELECT Order,Year FROM [Table B]
UNION ALL
SELECT Order,Year FROM [Table C]
My problem is, each year there is a new table to be added. One example is that Table D with corresponding record Order O1-20 and Year 2020. Instead of adding another set of UNION ALL, is there any other way to achieve the same result.
sql
sql-server asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
|
show 1 more comment
I have three tables:
Table A Table B Table C
______________ ______________ ______________
| Order | Year | | Order | Year | | Order | Year |
+--------------+ +--------------+ +--------------+
| O1-17 | 2017 | | O1-18 | 2018 | | O1-19 | 2019 |
+--------------+ +--------------+ +--------------+
I combined those tables using UNION ALL.
SELECT Order,Year FROM [Table A]
UNION ALL
SELECT Order,Year FROM [Table B]
UNION ALL
SELECT Order,Year FROM [Table C]
My problem is, each year there is a new table to be added. One example is that Table D with corresponding record Order O1-20 and Year 2020. Instead of adding another set of UNION ALL, is there any other way to achieve the same result.
sql
sql-server asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
2
Do you have to create a new table each year? Not good practice. Otherwise only option is to use dynamic SQL.
– Dale Burrell
Nov 20 '18 at 1:19
Yes, I have to. I just simplified my example. Actually each table is in different databases.
– Rigel1121
Nov 20 '18 at 1:21
Is it for reporting purposes?
– Dale Burrell
Nov 20 '18 at 1:22
yes. it is for reporting purposes.
– Rigel1121
Nov 20 '18 at 1:23
1
dynamic sql and cursors, I have worked on similar new tables", no way to delete so I might complete the comment....you can create empty new tables/database for next 20 years and just put in an error somewhere that its 2038 please create new tables! If you are for dynamic sql, its fairly easy just build the normal sql as string and then execute: mssqltips.com/sqlservertip/1160/…
– peeyush singh
Nov 20 '18 at 1:35
|
show 1 more comment
I have three tables:
Table A Table B Table C
______________ ______________ ______________
| Order | Year | | Order | Year | | Order | Year |
+--------------+ +--------------+ +--------------+
| O1-17 | 2017 | | O1-18 | 2018 | | O1-19 | 2019 |
+--------------+ +--------------+ +--------------+
I combined those tables using UNION ALL.
SELECT Order,Year FROM [Table A]
UNION ALL
SELECT Order,Year FROM [Table B]
UNION ALL
SELECT Order,Year FROM [Table C]
My problem is, each year there is a new table to be added. One example is that Table D with corresponding record Order O1-20 and Year 2020. Instead of adding another set of UNION ALL, is there any other way to achieve the same result.
sql
sql-server asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
I have three tables:
Table A Table B Table C
______________ ______________ ______________
| Order | Year | | Order | Year | | Order | Year |
+--------------+ +--------------+ +--------------+
| O1-17 | 2017 | | O1-18 | 2018 | | O1-19 | 2019 |
+--------------+ +--------------+ +--------------+
I combined those tables using UNION ALL.
SELECT Order,Year FROM [Table A]
UNION ALL
SELECT Order,Year FROM [Table B]
UNION ALL
SELECT Order,Year FROM [Table C]
My problem is, each year there is a new table to be added. One example is that Table D with corresponding record Order O1-20 and Year 2020. Instead of adding another set of UNION ALL, is there any other way to achieve the same result.
sql
sql-server sql
sql-server asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
asked Nov 20 '18 at 1:16
Rigel1121Rigel1121
1,86411122
1,86411122
2
Do you have to create a new table each year? Not good practice. Otherwise only option is to use dynamic SQL.
– Dale Burrell
Nov 20 '18 at 1:19
Yes, I have to. I just simplified my example. Actually each table is in different databases.
– Rigel1121
Nov 20 '18 at 1:21
Is it for reporting purposes?
– Dale Burrell
Nov 20 '18 at 1:22
yes. it is for reporting purposes.
– Rigel1121
Nov 20 '18 at 1:23
1
dynamic sql and cursors, I have worked on similar new tables", no way to delete so I might complete the comment....you can create empty new tables/database for next 20 years and just put in an error somewhere that its 2038 please create new tables! If you are for dynamic sql, its fairly easy just build the normal sql as string and then execute: mssqltips.com/sqlservertip/1160/…
– peeyush singh
Nov 20 '18 at 1:35
|
show 1 more comment
2
Do you have to create a new table each year? Not good practice. Otherwise only option is to use dynamic SQL.
– Dale Burrell
Nov 20 '18 at 1:19
Yes, I have to. I just simplified my example. Actually each table is in different databases.
– Rigel1121
Nov 20 '18 at 1:21
Is it for reporting purposes?
– Dale Burrell
Nov 20 '18 at 1:22
yes. it is for reporting purposes.
– Rigel1121
Nov 20 '18 at 1:23
1
dynamic sql and cursors, I have worked on similar new tables", no way to delete so I might complete the comment....you can create empty new tables/database for next 20 years and just put in an error somewhere that its 2038 please create new tables! If you are for dynamic sql, its fairly easy just build the normal sql as string and then execute: mssqltips.com/sqlservertip/1160/…
– peeyush singh
Nov 20 '18 at 1:35
2
2
Do you have to create a new table each year? Not good practice. Otherwise only option is to use dynamic SQL.
– Dale Burrell
Nov 20 '18 at 1:19
Do you have to create a new table each year? Not good practice. Otherwise only option is to use dynamic SQL.
– Dale Burrell
Nov 20 '18 at 1:19
Yes, I have to. I just simplified my example. Actually each table is in different databases.
– Rigel1121
Nov 20 '18 at 1:21
Yes, I have to. I just simplified my example. Actually each table is in different databases.
– Rigel1121
Nov 20 '18 at 1:21
Is it for reporting purposes?
– Dale Burrell
Nov 20 '18 at 1:22
Is it for reporting purposes?
– Dale Burrell
Nov 20 '18 at 1:22
yes. it is for reporting purposes.
– Rigel1121
Nov 20 '18 at 1:23
yes. it is for reporting purposes.
– Rigel1121
Nov 20 '18 at 1:23
1
1
dynamic sql and cursors, I have worked on similar new tables", no way to delete so I might complete the comment....you can create empty new tables/database for next 20 years and just put in an error somewhere that its 2038 please create new tables! If you are for dynamic sql, its fairly easy just build the normal sql as string and then execute: mssqltips.com/sqlservertip/1160/…
– peeyush singh
Nov 20 '18 at 1:35
dynamic sql and cursors, I have worked on similar new tables", no way to delete so I might complete the comment....you can create empty new tables/database for next 20 years and just put in an error somewhere that its 2038 please create new tables! If you are for dynamic sql, its fairly easy just build the normal sql as string and then execute: mssqltips.com/sqlservertip/1160/…
– peeyush singh
Nov 20 '18 at 1:35
|
show 1 more comment
1 Answer
1
active
oldest
votes
You have 3 options that I can think of:
1) Manually update the union in your query each year - not ideal but probably better than option 2.
2) Use dynamic SQL to build the query and it can automatically build the query based on the date the query is run. Its a bit ugly thought and performance might not be great.
3) This would be my preferred option, run a regular maintenance task to populate a completely separate table, in a single database, with just the data required for the report.
Option 2 might look like:
declare @StartYear int = 2015, @EndYear int = datepart(year, getdate()), @sql nvarchar(max) = '', @Index int;
set @Index = @StartYear;
declare @Years table ([Name] varchar(128));
while @Index <= @EndYear begin
insert into @Years ([Name])
select 'BaseTableName' + convert(varchar, @Index);
set @Index = @Index+1;
end
select @sql = @sql + case when len(@sql) > 0 then ' union all ' else '' end + 'select [Order], [Year] from ' + [Name]
from @Years
select @sql
--exec(@sql)
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
For me, the better option is number 2. And I'm researching for stored procedures with cursor, but I can't figure out on how to do it.
– Rigel1121
Nov 20 '18 at 1:33
@Rigel1121 I've added code for option 2 which should be enough to get you started.
– Dale Burrell
Nov 20 '18 at 1:42
add a comment |
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You have 3 options that I can think of:
1) Manually update the union in your query each year - not ideal but probably better than option 2.
2) Use dynamic SQL to build the query and it can automatically build the query based on the date the query is run. Its a bit ugly thought and performance might not be great.
3) This would be my preferred option, run a regular maintenance task to populate a completely separate table, in a single database, with just the data required for the report.
Option 2 might look like:
declare @StartYear int = 2015, @EndYear int = datepart(year, getdate()), @sql nvarchar(max) = '', @Index int;
set @Index = @StartYear;
declare @Years table ([Name] varchar(128));
while @Index <= @EndYear begin
insert into @Years ([Name])
select 'BaseTableName' + convert(varchar, @Index);
set @Index = @Index+1;
end
select @sql = @sql + case when len(@sql) > 0 then ' union all ' else '' end + 'select [Order], [Year] from ' + [Name]
from @Years
select @sql
--exec(@sql)
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
For me, the better option is number 2. And I'm researching for stored procedures with cursor, but I can't figure out on how to do it.
– Rigel1121
Nov 20 '18 at 1:33
@Rigel1121 I've added code for option 2 which should be enough to get you started.
– Dale Burrell
Nov 20 '18 at 1:42
add a comment |
You have 3 options that I can think of:
1) Manually update the union in your query each year - not ideal but probably better than option 2.
2) Use dynamic SQL to build the query and it can automatically build the query based on the date the query is run. Its a bit ugly thought and performance might not be great.
3) This would be my preferred option, run a regular maintenance task to populate a completely separate table, in a single database, with just the data required for the report.
Option 2 might look like:
declare @StartYear int = 2015, @EndYear int = datepart(year, getdate()), @sql nvarchar(max) = '', @Index int;
set @Index = @StartYear;
declare @Years table ([Name] varchar(128));
while @Index <= @EndYear begin
insert into @Years ([Name])
select 'BaseTableName' + convert(varchar, @Index);
set @Index = @Index+1;
end
select @sql = @sql + case when len(@sql) > 0 then ' union all ' else '' end + 'select [Order], [Year] from ' + [Name]
from @Years
select @sql
--exec(@sql)
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
For me, the better option is number 2. And I'm researching for stored procedures with cursor, but I can't figure out on how to do it.
– Rigel1121
Nov 20 '18 at 1:33
@Rigel1121 I've added code for option 2 which should be enough to get you started.
– Dale Burrell
Nov 20 '18 at 1:42
add a comment |
You have 3 options that I can think of:
1) Manually update the union in your query each year - not ideal but probably better than option 2.
2) Use dynamic SQL to build the query and it can automatically build the query based on the date the query is run. Its a bit ugly thought and performance might not be great.
3) This would be my preferred option, run a regular maintenance task to populate a completely separate table, in a single database, with just the data required for the report.
Option 2 might look like:
declare @StartYear int = 2015, @EndYear int = datepart(year, getdate()), @sql nvarchar(max) = '', @Index int;
set @Index = @StartYear;
declare @Years table ([Name] varchar(128));
while @Index <= @EndYear begin
insert into @Years ([Name])
select 'BaseTableName' + convert(varchar, @Index);
set @Index = @Index+1;
end
select @sql = @sql + case when len(@sql) > 0 then ' union all ' else '' end + 'select [Order], [Year] from ' + [Name]
from @Years
select @sql
--exec(@sql)
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
You have 3 options that I can think of:
1) Manually update the union in your query each year - not ideal but probably better than option 2.
2) Use dynamic SQL to build the query and it can automatically build the query based on the date the query is run. Its a bit ugly thought and performance might not be great.
3) This would be my preferred option, run a regular maintenance task to populate a completely separate table, in a single database, with just the data required for the report.
Option 2 might look like:
declare @StartYear int = 2015, @EndYear int = datepart(year, getdate()), @sql nvarchar(max) = '', @Index int;
set @Index = @StartYear;
declare @Years table ([Name] varchar(128));
while @Index <= @EndYear begin
insert into @Years ([Name])
select 'BaseTableName' + convert(varchar, @Index);
set @Index = @Index+1;
end
select @sql = @sql + case when len(@sql) > 0 then ' union all ' else '' end + 'select [Order], [Year] from ' + [Name]
from @Years
select @sql
--exec(@sql)
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
edited Nov 20 '18 at 1:41
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
answered Nov 20 '18 at 1:27
Dale BurrellDale Burrell
3,23832552
3,23832552
For me, the better option is number 2. And I'm researching for stored procedures with cursor, but I can't figure out on how to do it.
– Rigel1121
Nov 20 '18 at 1:33
@Rigel1121 I've added code for option 2 which should be enough to get you started.
– Dale Burrell
Nov 20 '18 at 1:42
add a comment |
For me, the better option is number 2. And I'm researching for stored procedures with cursor, but I can't figure out on how to do it.
– Rigel1121
Nov 20 '18 at 1:33
@Rigel1121 I've added code for option 2 which should be enough to get you started.
– Dale Burrell
Nov 20 '18 at 1:42
For me, the better option is number 2. And I'm researching for stored procedures with cursor, but I can't figure out on how to do it.
– Rigel1121
Nov 20 '18 at 1:33
For me, the better option is number 2. And I'm researching for stored procedures with cursor, but I can't figure out on how to do it.
– Rigel1121
Nov 20 '18 at 1:33
@Rigel1121 I've added code for option 2 which should be enough to get you started.
– Dale Burrell
Nov 20 '18 at 1:42
@Rigel1121 I've added code for option 2 which should be enough to get you started.
– Dale Burrell
Nov 20 '18 at 1:42
add a comment |
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2
Do you have to create a new table each year? Not good practice. Otherwise only option is to use dynamic SQL.
– Dale Burrell
Nov 20 '18 at 1:19
Yes, I have to. I just simplified my example. Actually each table is in different databases.
– Rigel1121
Nov 20 '18 at 1:21
Is it for reporting purposes?
– Dale Burrell
Nov 20 '18 at 1:22
yes. it is for reporting purposes.
– Rigel1121
Nov 20 '18 at 1:23
1
dynamic sql and cursors, I have worked on similar new tables", no way to delete so I might complete the comment....you can create empty new tables/database for next 20 years and just put in an error somewhere that its 2038 please create new tables! If you are for dynamic sql, its fairly easy just build the normal sql as string and then execute: mssqltips.com/sqlservertip/1160/…
– peeyush singh
Nov 20 '18 at 1:35