Nastavení schématu MS SQL Server 2014 :
CREATE TABLE table_name ( name VARCHAR(50) );
INSERT INTO table_name
SELECT 'AE 344592001H 6186694' UNION ALL
SELECT 'AE_161038002_6044777' UNION ALL
SELECT 'BC_VIVS_HNB011A_1WAM' UNION ALL
SELECT 'BC_56230A_30SP' UNION ALL
SELECT 'CG_3334902_NETWK_ ACTLM_3334912' UNION ALL
SELECT 'CG_3334574_HMO1_CORACT_3334575' UNION ALL
SELECT 'CG_3207160_POSC_1502AH_3207161' UNION ALL
SELECT 'UH_141015_RHM' UNION ALL
SELECT 'UH_127757_RIV' UNION ALL
SELECT 'UH 523725 RIV' UNION ALL
SELECT 'BS_W0055785_C500_M0005672';
Dotaz 1 :
WITH Names ( lvl, name, remaining, idx ) AS (
SELECT 1,
name,
name,
CHARINDEX( '_', name )
FROM table_name
UNION ALL
SELECT lvl+1,
name,
SUBSTRING(remaining,idx+1,LEN(remaining)-idx),
CASE WHEN CHARINDEX( '_', remaining, idx+1 ) = 0
THEN 0
ELSE CHARINDEX( '_', remaining, idx+1 ) - idx
END
FROM Names
WHERE idx > 0
)
SELECT Name,
MAX( CASE WHEN lvl = 3 AND ( Name LIKE 'CG%' OR idx = 0 ) THEN remaining
WHEN lvl = 3 THEN SUBSTRING( remaining, 1, idx - 1 )
END ) AS OPT,
MAX( CASE WHEN lvl = 2 AND ( Name LIKE 'CG%' OR idx = 0 ) THEN remaining
WHEN lvl = 2 THEN SUBSTRING( remaining, 1, idx - 1 )
END ) AS Name2
FROM Names
GROUP BY Name
Výsledky :
| Name | OPT | Name2 |
|---------------------------------|----------------------|------------------------------|
| AE 344592001H 6186694 | (null) | (null) |
| AE_161038002_6044777 | 6044777 | 161038002 |
| BC_56230A_30SP | 30SP | 56230A |
| BC_VIVS_HNB011A_1WAM | HNB011A | VIVS |
| BS_W0055785_C500_M0005672 | C500 | W0055785 |
| CG_3207160_POSC_1502AH_3207161 | POSC_1502AH_3207161 | 3207160_POSC_1502AH_3207161 |
| CG_3334574_HMO1_CORACT_3334575 | HMO1_CORACT_3334575 | 3334574_HMO1_CORACT_3334575 |
| CG_3334902_NETWK_ ACTLM_3334912 | NETWK_ ACTLM_3334912 | 3334902_NETWK_ ACTLM_3334912 |
| UH 523725 RIV | (null) | (null) |
| UH_127757_RIV | RIV | 127757 |
| UH_141015_RHM | RHM | 141015 |
Dotaz 2 :
CHARINDEX( expressionToFind, expressionToSerach[, startIndex] )
lze použít k nalezení instancí _
ve slově.
CHARINDEX( '_', name )
najde index první instance_
.CHARINDEX( '_', name, CHARINDEX( '_', name ) + 1 )
najde index druhé instance_
nebo vrátí0
pokud nejsou dva_
znaky.CHARINDEX( '_', name, CHARINDEX( '_', name, CHARINDEX( '_', name ) + 1 ) + 1)
najde index třetí instance_
nebo vrátí0
pokud nejsou tři_
znaky.
Vnořením tohoto do vnitřního výběru jej můžete použít k získání příslušného SUBSTRING
s ve vnějším výběru takto:
SELECT name,
CASE WHEN idx2 > idx1 AND ( Name LIKE 'CG%' OR idx3 = 0 )THEN SUBSTRING( name, idx2 + 1, LEN( name ) )
WHEN idx3 > idx2 THEN SUBSTRING( name, idx2 + 1, idx3 - idx2 - 1 )
END AS OPT,
CASE WHEN name LIKE 'CG%' THEN SUBSTRING( name, idx1 + 1, LEN( name ) )
WHEN idx2 > idx1 THEN SUBSTRING( name, idx1 + 1, idx2 - idx1 - 1 )
END AS Name2
FROM (
SELECT name,
CHARINDEX( '_', name ) AS idx1,
CHARINDEX( '_', name, CHARINDEX( '_', name ) + 1 ) AS idx2,
CHARINDEX( '_', name, CHARINDEX( '_', name, CHARINDEX( '_', name ) + 1 ) + 1 ) AS idx3
FROM table_name
) t
Výsledky :
| name | OPT | Name2 |
|---------------------------------|----------------------|------------------------------|
| AE 344592001H 6186694 | (null) | (null) |
| AE_161038002_6044777 | 6044777 | 161038002 |
| BC_VIVS_HNB011A_1WAM | HNB011A | VIVS |
| BC_56230A_30SP | 30SP | 56230A |
| CG_3334902_NETWK_ ACTLM_3334912 | NETWK_ ACTLM_3334912 | 3334902_NETWK_ ACTLM_3334912 |
| CG_3334574_HMO1_CORACT_3334575 | HMO1_CORACT_3334575 | 3334574_HMO1_CORACT_3334575 |
| CG_3207160_POSC_1502AH_3207161 | POSC_1502AH_3207161 | 3207160_POSC_1502AH_3207161 |
| UH_141015_RHM | RHM | 141015 |
| UH_127757_RIV | RIV | 127757 |
| UH 523725 RIV | (null) | (null) |
| BS_W0055785_C500_M0005672 | C500 | W0055785 |