Convert a SQL SELECT into an INSERT Script

Sometimes you want to generate an INSERT script from existing data, perhaps with one or two values tweaked. It’s a pain to hand-crank the INSERT when you can see exactly what you want using a SELECT statement. It’s also a bit long-winded to use SQL import/export wizards or other tools. Sometimes, you just want to convert a SQL SELECT into an INSERT script. Here’s how.

Change the three user variables at the top to say

Whether the primary key field should be included or not
Which table you want to operate against
What filter you want to apply to the data, for example WHERE Id = 1

DECLARE 
     @includePK BIT = 1,
     @table VARCHAR(MAX) = 'LogEntry',
     @dataFilter VARCHAR(MAX) = 'WHERE date = ''2020-03-10'' '

DECLARE 
     @columnNames VARCHAR(MAX) = '',
     @getDataColumnScript VARCHAR(MAX),
     @queryToGenerateScript VARCHAR(MAX)

-- Get a list of all colmuns
SELECT @columnNames = STUFF
(
    (
     SELECT ',['+ NAME +']' FROM sys.all_columns 
     WHERE OBJECT_ID = OBJECT_ID(@table)
     AND (is_identity != 1 OR @includePK = 1)
     FOR XML PATH('')
    ),
     1,
     1,
     ''
)

-- Create a the column part of the select using the column names
SELECT @getDataColumnScript = STUFF
(
    (
     SELECT ' ISNULL(QUOTENAME(' + NAME + ',' + QUOTENAME('''','''''') + '),' + '''NULL''' + ')+'',''' + '+' FROM sys.all_columns 
     WHERE OBJECT_ID = OBJECT_ID(@table)
     AND (is_identity != 1 OR @includePK = 1)
     FOR XML PATH('')
    ),
     1,
     1,
     ''
)

SELECT @queryToGenerateScript = 'SELECT ''' +
     'INSERT INTO ' + @table + '(' + @columnNames + ')' + 
     'VALUES(''' + '+' + SUBSTRING(@getDataColumnScript, 1, LEN(@getDataColumnScript) -5) + '+' + ''')''' + ' OutputScript ' +
     'FROM ' + @table + ' ' + @dataFilter

EXECUTE (@queryToGenerateScript)

Result (it doesn’t come out looking “pretty”, but I made it readable here by adding whitespace).

INSERT INTO LogEntry(
    [date],
    [time],
    [s_ip],
    [cs_method],
    [cs_uri_stem],
    [cs_uri_query],
    [s_port],
    [cs_username],
    [c_ip],
    [cs_User_Agent],
    [cs_Referer],
    [cs_host],
    [sc_status],
    [sc_substatus],
    [sc_win32_status],
    [time_taken],
    [X_Forwarded_For]
)
VALUES(
    '2020-03-10 00:00:00.0000000',
    '1900-01-01 09:40:09.0000000',
    '10.150.101.104',
    'GET',
    '/some-page-name',
    '-',
    '80',
    '-',
    '0.0.0.0',
    'Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/80.0.3987.132+Safari/537.36',
    'https://www.example.com/',
    'www.example.com',
    '200',
    '0',
    '0',
    '0',
    '1.1.1.1'
)

There are some limitations. This script isn’t going to check your column types, so everything is gonna be a string. SQL usually does alright with this, but you might find some loss of precision in datetime fields. It also doesn’t append the additional code to set identity insert on. I might add this later.