Match ALL (not ANY) values from a WHERE clause [duplicate] - tsql

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SQL efficient way to join a table where all values exist
(3 answers)
Closed 4 years ago.
TL;DR How do I find rows in a table that match ALL (not ANY) rows from another table?
This seems so simple but I don't know the correct terminology, so am seeing dozens of answers that use INNER JOIN, INTERSECT, EXISTS or ALL, but don't achieve what I need. The other questions are either PostgreSQL, dynamically generated SQL via the application, or are unanswered.
Take the following people who like different colors:
DECLARE #tbl TABLE (
FirstName nvarchar(50),
Color nvarchar(50)
);
INSERT INTO #tbl
(FirstName, Color)
VALUES
('Bob', 'Purple'),
('Bob', 'Red'),
('Bob', 'Yellow'),
('Fred', 'Purple'),
('Fred', 'Red'),
('Fred', 'Yellow'),
('Greg', 'Orange'),
('Greg', 'Red'),
('Harry', 'Red');
I need to find people who like ALL of the colors I'm searching for.
DECLARE #SearchColors TABLE (SearchColor nvarchar(50));
INSERT INTO #SearchColors (SearchColor) VALUES ('Red'),('Yellow');
So I would only expect to see Bob and Fred in the results, because only those two people like ALL of the colours I'm searching for. I don't want people who only like a single colour, however, it doesn't matter if people like more than both of those colours (e.g. Bob likes 3 colors, including the two I need).
Reading through books online, I found ALL, which appeared close to what I need, but actually finds nothing (unless I'm using it wrong):
SELECT
*
FROM
#tbl
WHERE
(Color = ALL ( SELECT SearchColor FROM #SearchColors ));

Answer 1

What about getting the total count of colors you are looking for, filtering your main table for those, then counting names that have that many entries?
DECLARE #colorcount INT = (SELECT COUNT(DISTINCT SearchColor) FROM #SearchColors)
SELECT firstname
FROM #tbl
WHERE color IN (SELECT searchcolor FROM #SearchColors)
GROUP BY firstname
HAVING COUNT(DISTINCT color) = #colorcount
This will handle dupes in your #tbl if ('Greg', 'Red') is in there twice or if your #searchcolors table has ('Red') twice