Dynamically create sql table from table list - sql

Question

I'm trying to create a bunch of tables in a schema base on a table list that pulls its table names from another schema
example
schA table1
schA table2
schA table3
dbo tablelist contains this tables in schema schA
so either i need to have some code that says
look at dbo tablelist verify it exists i
if not select table structure into schB from tables on database (where this doesn't exists)
my issue is the loop around
I'm not asking for someone to fully write this code (would be helpful though:-)
but how to structure my query or the best way to start
super thanks in advance

Answer 1

Possible this be helpful for you -
DDL:
CREATE TABLE [dbo].[test1](
[company_id] [int] NOT NULL PRIMARY KEY,
[staff_name] [nvarchar](50) NULL,
[email] [nvarchar](50) NULL
) ON [PRIMARY]
Query:
DECLARE
#table_name SYSNAME
, #name_for_new_table SYSNAME
, #schema_for_new_table SYSNAME
SELECT
#table_name = 'dbo.test1'
, #schema_for_new_table = 'dbo'
, #name_for_new_table = 'test1_new'
DECLARE #SQL NVARCHAR(MAX) = ''
;WITH tbl AS
(
SELECT o.[object_id]
FROM sys.objects o WITH (NOWAIT)
WHERE SCHEMA_NAME(o.[schema_id]) + '.' + o.name = #table_name
AND o.[type] = 'U'
AND o.is_ms_shipped = 0
),
index_column AS
(
SELECT
ic.[object_id]
, ic.index_id
, ic.is_descending_key
, ic.is_included_column
, c.name
FROM sys.index_columns ic WITH (NOWAIT)
JOIN sys.columns c WITH (NOWAIT) ON ic.[object_id] = c.[object_id] AND ic.column_id = c.column_id
WHERE ic.[object_id] IN (SELECT t.[object_id] FROM tbl t)
),
fk_columns AS
(
SELECT
k.constraint_object_id
, cname = c.name
, rcname = rc.name
FROM sys.foreign_key_columns k WITH (NOWAIT)
JOIN sys.columns rc WITH (NOWAIT) ON rc.[object_id] = k.referenced_object_id AND rc.column_id = k.referenced_column_id
JOIN sys.columns c WITH (NOWAIT) ON c.[object_id] = k.parent_object_id AND c.column_id = k.parent_column_id
)
SELECT #SQL = 'CREATE TABLE [' + #schema_for_new_table + '].[' + #name_for_new_table + ']' + CHAR(13) + '(' + CHAR(13) + STUFF((
SELECT DISTINCT CHAR(9) + ', [' + c.name + '] ' + UPPER(t.name) +
CASE WHEN t.name IN ('varchar', 'char', 'varbinary', 'binary', 'text')
THEN '(' + CASE WHEN c.max_length = -1 THEN N'MAX' ELSE CAST(c.max_length AS NVARCHAR(5)) END + ')'
WHEN t.name IN ('nvarchar', 'nchar', 'ntext')
THEN '(' + CASE WHEN c.max_length = -1 THEN N'MAX' ELSE CAST(c.max_length / 2 AS NVARCHAR(5)) END + ')'
WHEN t.name IN ('datetime2', 'time2', 'datetimeoffset')
THEN '(' + CAST(c.scale AS NVARCHAR(5)) + ')'
WHEN t.name = 'decimal'
THEN '(' + CAST(c.[precision] AS NVARCHAR(5)) + ',' + CAST(c.scale AS NVARCHAR(5)) + ')'
ELSE ''
END +
CASE WHEN c.collation_name IS NOT NULL THEN ' COLLATE ' + c.collation_name ELSE '' END +
CASE WHEN c.is_nullable = 1 THEN ' NULL' ELSE ' NOT NULL' END +
CASE WHEN c.[definition] IS NOT NULL THEN ' DEFAULT' + c.[definition] ELSE '' END +
CASE WHEN c.is_identity = 1 THEN ' IDENTITY(' + CAST(ISNULL(c.seed_value, '0') AS CHAR(1)) + ',' + CAST(ISNULL(c.increment_value, '1') AS CHAR(1)) + ')' ELSE '' END + CHAR(13)
FROM (
SELECT
c.name
, c.user_type_id
, c.max_length
, c.[precision]
, c.scale
, dc.[definition]
, ic.seed_value
, ic.increment_value
, c.collation_name
, c.is_nullable
, c.is_identity
FROM sys.columns c WITH (NOWAIT)
LEFT JOIN sys.default_constraints dc WITH (NOWAIT) ON c.default_object_id != 0 AND c.[object_id] = dc.parent_object_id AND c.column_id = dc.parent_column_id
LEFT JOIN sys.identity_columns ic WITH (NOWAIT) ON c.is_identity = 1 AND c.[object_id] = ic.[object_id] AND c.column_id = ic.column_id
WHERE c.[object_id] IN (SELECT o.[object_id] FROM tbl o)
) c
JOIN sys.types t WITH (NOWAIT) ON c.user_type_id = t.user_type_id
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, CHAR(9) + ' ')
+ ISNULL((SELECT CHAR(9) + ', CONSTRAINT [PK_' + #schema_for_new_table + '_' + #name_for_new_table + '] PRIMARY KEY (' +
(SELECT STUFF((
SELECT DISTINCT ', [' + c.name + ']' + CASE WHEN ic.is_descending_key = 1 THEN ' DESC' ELSE ' ASC' END
FROM sys.key_constraints k WITH (NOWAIT)
JOIN sys.index_columns ic WITH (NOWAIT) ON ic.[object_id] = k.parent_object_id AND ic.index_id = k.unique_index_id
JOIN sys.columns c WITH (NOWAIT) ON c.[object_id] = k.parent_object_id AND c.column_id = ic.column_id
WHERE k.[type] = 'PK'
AND ic.is_included_column = 0
AND k.parent_object_id IN (SELECT t.[object_id] FROM tbl t)
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '')) + ')' + CHAR(13)), '')
+ ')' + CHAR(13)
+ ISNULL((SELECT (
SELECT CHAR(13) +
'ALTER TABLE [' + #schema_for_new_table + '].[' + #name_for_new_table + '] WITH'
+ CASE WHEN fk.is_not_trusted = 1
THEN ' NOCHECK'
ELSE ' CHECK'
END +
' ADD CONSTRAINT [FK_' + #schema_for_new_table + '_' + #name_for_new_table + '_' + fk.name + '] FOREIGN KEY('
+ STUFF((
SELECT ', [' + k.cname + ']'
FROM fk_columns k
WHERE k.constraint_object_id = fk.[object_id]
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '')
+ ')' +
' REFERENCES [' + SCHEMA_NAME(ro.[schema_id]) + '].[' + ro.name + '] ('
+ STUFF((
SELECT ', [' + k.rcname + ']'
FROM fk_columns k
WHERE k.constraint_object_id = fk.[object_id]
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '')
+ ')'
+ CASE
WHEN fk.delete_referential_action = 1 THEN ' ON DELETE CASCADE'
WHEN fk.delete_referential_action = 2 THEN ' ON DELETE SET NULL'
WHEN fk.delete_referential_action = 3 THEN ' ON DELETE SET DEFAULT'
ELSE ''
END
+ CASE
WHEN fk.update_referential_action = 1 THEN ' ON UPDATE CASCADE'
WHEN fk.update_referential_action = 2 THEN ' ON UPDATE SET NULL'
WHEN fk.update_referential_action = 3 THEN ' ON UPDATE SET DEFAULT'
ELSE ''
END
+ CHAR(13) + 'ALTER TABLE [' + #schema_for_new_table + '].[' + #name_for_new_table + '] CHECK CONSTRAINT [FK_' + #schema_for_new_table + '_' + #name_for_new_table + '_' + fk.name + ']' + CHAR(13)
FROM sys.foreign_keys fk WITH (NOWAIT)
JOIN sys.objects ro WITH (NOWAIT) ON ro.[object_id] = fk.referenced_object_id
WHERE fk.parent_object_id IN (SELECT t.[object_id] FROM tbl t)
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)')), '')
+ ISNULL(((SELECT
CHAR(13) + 'CREATE' + CASE WHEN i.is_unique = 1 THEN ' UNIQUE' ELSE '' END + ' NONCLUSTERED INDEX [IX_' + #schema_for_new_table + '_' + #name_for_new_table + '_' + i.name + '] ON [' + #schema_for_new_table + '].[' + #name_for_new_table + '] (' +
STUFF((
SELECT ', [' + c.name + ']' + CASE WHEN c.is_descending_key = 1 THEN ' DESC' ELSE ' ASC' END
FROM index_column c
WHERE c.is_included_column = 0
AND c.index_id = i.index_id
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '') + ')'
+ ISNULL(CHAR(13) + 'INCLUDE (' +
STUFF((
SELECT ', [' + c.name + ']'
FROM index_column c
WHERE c.is_included_column = 1
AND c.index_id = i.index_id
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)'), 1, 2, '') + ')', '') + CHAR(13)
FROM sys.indexes i WITH (NOWAIT)
WHERE i.[object_id] IN (SELECT t.[object_id] FROM tbl t)
AND i.is_primary_key = 0
AND i.[type] = 2
FOR XML PATH(N''), TYPE, ROOT).value('root[1]', 'NVARCHAR(MAX)')
), '')
PRINT #SQL
--EXEC sys.sp_executesql #SQL
Output:
CREATE TABLE [dbo].[test1_new]
(
[company_id] INT NOT NULL
, [email] NVARCHAR(50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
, [staff_name] NVARCHAR(50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
, CONSTRAINT [PK_dbo_test1_new] PRIMARY KEY ([company_id] ASC)
)