En SEARCH TREE.sql

/* Construction of a tree of product categories for a given type of vehicle (TYP_ID) */

SET @TYP_ID = 3822; /* ALFA ROMEO 145 (930) 1.4 i.e. [1994/07-1996/12] */
SET @LNG_ID = 16; /* 1 - German; 16 - Russian */
SET @STR_ID = NULL; /* Tree root */

/* By consecutive setting of the following STR_ID values you can get 4 more tree levels: */

/* SET @STR_ID = 10001; /* Passenger cars */

/* SET @STR_ID = 10102; /* Engine */

/* SET @STR_ID = 10615; /* Crank gear */

/* SET @STR_ID = 10620; /* Piston */

/* Display of a list of subcategories for the selected category with @STR_ID number,*/

/* containing products for a given type of vehicle (TYP_ID) */

/* STR_ID - Category number */

/* STR_DES_TEXT - Category name */

/* DESCENDANTS - Whether the given category has subcategories: 1 - Has, 0 - Has not */

SELECT	STR_ID,	TEX_TEXT AS STR_DES_TEXT,	IF(		EXISTS(			SELECT				*
FROM  	SEARCH_TREE AS SEARCH_TREE2
WHERE				SEARCH_TREE2.STR_ID_PARENT <=> SEARCH_TREE.STR_ID
LIMIT	1), 1, 0) AS DESCENDANTS
FROM           SEARCH_TREE
INNER JOIN DESIGNATIONS ON DES_ID = STR_DES_ID
INNER JOIN DES_TEXTS ON TEX_ID = DES_TEX_ID
WHERE	STR_ID_PARENT <=> @STR_ID AND	DES_LNG_ID = @LNG_ID AND	EXISTS (
SELECT			*
FROM			           LINK_GA_STR 
INNER JOIN LINK_LA_TYP ON LAT_TYP_ID = @TYP_ID AND                     LAT_GA_ID = LGS_GA_ID
INNER JOIN LINK_ART ON LA_ID = LAT_LA_ID
WHERE			LGS_STR_ID = STR_ID
LIMIT	1	);

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