Some more tricks using CTE and recursivity...
1) How to split a string into words ?
[font="Courier New"]-- here is the table :
CREATE TABLE TRolePers
(
idPers int,
Role varchar(50)
)
-- containing:
INSERT INTO TRolePers VALUES (1, 'RespX, RespY')
INSERT INTO TRolePers VALUES (2, 'Admin')
INSERT INTO TRolePers VALUES (3, 'RespX, RespZ, RespY')
/*
Find the query that can split the sentence into the columns, every words been delimited par the comma.
How to obtain such a result ?
idPers Role
----------- --------------------------------------------------
1 RespX
1 RespY
2 Admin
3 RespX
3 respY
3 RespZ
*/
-- solution :
WITH T
AS
(
SELECT idPers,
CASE
WHEN CHARINDEX(',', Role) > 0 THEN LTRIM(SUBSTRING(Role, 1, CHARINDEX(',', Role) - 1))
ELSE Role
END AS UnRole,
LTRIM(SUBSTRING(Role, CHARINDEX(',', Role) + 1, LEN(Role) - CHARINDEX(',', Role))) AS LesAutresRoles
FROM TRolePers
UNION ALL
SELECT RP.idPers,
CASE
WHEN CHARINDEX(',', LesAutresRoles) > 0 THEN LTRIM(SUBSTRING(LesAutresRoles, 1, CHARINDEX(',', LesAutresRoles) - 1))
ELSE LesAutresRoles
END,
CASE
WHEN CHARINDEX(',', LesAutresRoles) > 0 THEN LTRIM(SUBSTRING(LesAutresRoles, CHARINDEX(',', LesAutresRoles) + 1, LEN(LesAutresRoles) - CHARINDEX(',',
LesAutresRoles)))
ELSE NULL
END
FROM TRolePers RP
INNER JOIN T
ON T.idPers = RP.idPers
WHERE LesAutresRoles IS NOT NULL
)
SELECT DISTINCT idPers, UnRole As Role
FROM T
ORDER BY 1, 2
/*
idPers Role
----------- --------------------------------------------------
1 RespX
1 RespY
2 Admin
3 RespX
3 respY
3 RespZ
(6 ligne(s) affectée(s))
*/[/font]
2) how to concatenate words to obtain sentences
[font="Courier New"]-- Here is a table :
CREATE TABLE T_PHRASE_PHR
(PHR_ID INTEGER NOT NULL,
PHR_MOT_POSITION INTEGER NOT NULL,
PHR_MOT VARCHAR(32) NOT NULL,
CONSTRAINT PK_PHR PRIMARY KEY (PHR_ID, PHR_MOT_POSITION));
-- containing :
INSERT INTO T_PHRASE_PHR VALUES (1, 1, 'Le')
INSERT INTO T_PHRASE_PHR VALUES (1, 2, 'petit')
INSERT INTO T_PHRASE_PHR VALUES (1, 3, 'chat')
INSERT INTO T_PHRASE_PHR VALUES (1, 4, 'est')
INSERT INTO T_PHRASE_PHR VALUES (1, 5, 'mort')
INSERT INTO T_PHRASE_PHR VALUES (2, 1, 'Les')
INSERT INTO T_PHRASE_PHR VALUES (2, 2, 'sanglots')
INSERT INTO T_PHRASE_PHR VALUES (2, 3, 'longs')
INSERT INTO T_PHRASE_PHR VALUES (2, 4, 'des')
INSERT INTO T_PHRASE_PHR VALUES (2, 5, 'violons')
INSERT INTO T_PHRASE_PHR VALUES (2, 6, 'de')
INSERT INTO T_PHRASE_PHR VALUES (2, 7, 'l''')
INSERT INTO T_PHRASE_PHR VALUES (2, 8, 'automne')
INSERT INTO T_PHRASE_PHR VALUES (2, 9, 'blessent')
INSERT INTO T_PHRASE_PHR VALUES (2, 10, 'mon')
INSERT INTO T_PHRASE_PHR VALUES (2, 11, 'coeur')
INSERT INTO T_PHRASE_PHR VALUES (2, 12, 'd''')
INSERT INTO T_PHRASE_PHR VALUES (2, 13, 'une')
INSERT INTO T_PHRASE_PHR VALUES (2, 14, 'langueur')
INSERT INTO T_PHRASE_PHR VALUES (2, 15, 'monotone')
/*
Find a query that can retrieve the sentence by compounding the words in the column PHR_MOT_POSITION order.
How to obtain such a result ?
id PHRASE
----------- ------------------------------------------------------------------------------------------
1 Le petit chat est mort.
2 Les sanglots longs des violons de l'automne blessent mon coeur d'une langueur monotone.
*/
-- solution
WITH
phrases (phrase, id, position)
AS
(
SELECT CAST(PHR_MOT AS VARCHAR(max))
+ CASE
WHEN SUBSTRING(PHR_MOT, LEN(PHR_MOT), 1) = '''' THEN ''
ELSE ' '
END, PHR_ID, PHR_MOT_POSITION
FROM T_PHRASE_PHR
WHERE PHR_MOT_POSITION = 1
UNION ALL
SELECT phrase + CAST(PHR_MOT AS VARCHAR(max))
+ CASE
WHEN SUBSTRING(PHR_MOT, LEN(PHR_MOT), 1) = '''' THEN ''
ELSE ' '
END AS PHRASE,
PHR_ID, PHR_MOT_POSITION
FROM T_PHRASE_PHR AS suiv
INNER JOIN phrases
ON suiv.PHR_ID = phrases.id
AND suiv.PHR_MOT_POSITION = phrases.position + 1
),
maxphrase
AS
(
SELECT id, MAX(position) AS maxposition
FROM phrases
GROUP BY id
)
SELECT P.id, phrase + '.' AS PHRASE
FROM phrases AS P
INNER JOIN maxphrase AS M
ON P.id = M.id
AND P.position = M.maxposition
ORDER BY id
/*
id PHRASE
----------- ------------------------------------------------------------------------------------------
1 Le petit chat est mort.
2 Les sanglots longs des violons de l'automne blessent mon coeur d'une langueur monotone.
(2 ligne(s) affectée(s))
*/[/font]
A +