您可以简单地使用 T-SQL 的字符串连接运算符“+”
SELECT c1 + c2 + c3 + c4 + c5 + ...
FROM myTable
如果某些列可能包含空值,您可以使用ISNULL() 函数, as in
SELECT ISNULL(c1, '') + ISNULL(c2, 'x') + ... -- note how you can substribute NULLs with any desired value
FROM myTable
You can 动态创建这样的 SELECT 语句通过利用 SQL Server 元数据:
SELECT COLUMN_NAME, *
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = 'myTable'
AND DATA_TYPE IN ('char', 'varchar') -- can further filter out non desired colums
order by ORDINAL_POSITION -- and also pick a given order
例如
DECLARE @SqlStmt AS VARCHAR(8000)
DECLARE @Ctr AS INT
DECLARE @ColName AS VARCHAR(80)
DECLARE colCursor CURSOR
FOR SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = 'myTable'
AND DATA_TYPE IN ('char', 'varchar')
ORDER BY ORDINAL_POSITION
FOR READ ONLY;
OPEN colCursor;
SET @Ctr = 0
SET @SqlStmt = 'SELECT '
FETCH NEXT FROM colCursor INTO @colName;
WHILE @@FETCH_STATUS = 0
BEGIN
IF @Ctr > 0
BEGIN
SET @SqlStmt = @SqlStmt + ' + '; -- w/o the spaces if size is a pb
END
SET @Ctr = @Ctr + 1;
SET @SqlStmt = @SqlStmt + @ColName; -- w/ ISNULL if needed...
FETCH NEXT FROM colCursor INTO @colName;
END;
CLOSE colCursor
DEALLOCATE colCursor
SET @SqlStmt = @SqlStmt + ' FROM ' + 'myTable'
-- Here to add to @SqlStmt (WHERE clause, other columns, other
-- tables/join whatever...
PRINT @SqlStmt -- OR EXEC() it ...