SELECT products_description.products_title,
product_settings.setting_value,
products_description.product_description,
products_description.long_description,
products_additional_option_description.title,
products_sizes.size_title,
product_category_description.category_name,
products.products_id,
products_description.imagename,
Match (products_description.products_title) against ('bu*' IN boolean mode) AS rel_products_description_products_title,
match (products_description.product_description) against ('bu*' IN boolean mode) AS rel_products_description_product_description,
match (products_description.long_description) against ('bu*' IN boolean mode) AS rel_products_description_long_description,
match (product_settings.setting_value) against ('bu*' IN boolean mode) AS rel_product_settings_setting_value,
match (products_additional_option_description.title) against ('bu*' IN boolean mode) AS rel_products_additional_option_description_title,
match (products_sizes.size_title) against ('bu*' IN boolean mode) AS rel_products_sizes_size_title,
match (product_category_description.category_name) against ('bu*' IN boolean mode) AS rel_product_category_description_category_name ,
CASE
WHEN store_products_description.products_title IS NOT NULL
AND store_products_description.products_title!='' THEN store_products_description.products_title
ELSE products_description.products_title
END AS products_title,
CASE
WHEN store_products_description.product_description IS NOT NULL
AND store_products_description.product_description!='' THEN store_products_description.product_description
ELSE products_description.product_description
END AS product_description,
CASE
WHEN store_products_description.long_description IS NOT NULL
AND store_products_description.long_description!='' THEN store_products_description.long_description
ELSE products_description.long_description
END AS long_description ,
store_products.store_products_id
FROM products
LEFT JOIN products_description
ON products_description.products_id = products.products_id
LEFT JOIN store_products
ON store_products.products_id = products.products_id
LEFT JOIN store_products_description
ON store_products.store_products_id = store_products_description.store_products_id
AND products_description.site_language_id = store_products_description.site_language_id
LEFT JOIN products_additional_option
ON products_additional_option.products_id = products.products_id
LEFT JOIN products_additional_option_description
ON products_additional_option_description.prod_add_opt_id = products_additional_option.prod_add_opt_id
LEFT JOIN product_settings
ON product_settings.products_id = products.products_id
AND product_settings.setting_constant_name = 'PRODUCT_SKU_NUMBER'
LEFT JOIN product_category
ON product_category.category_id = products.category_id
LEFT JOIN product_category_description
ON product_category.category_id = product_category_description.category_id
LEFT JOIN products_sizes
ON products_sizes.products_id = products.products_id
WHERE 1
AND products.visible = '1'
AND store_products.visible = '1'
AND products.products_id != '-11'
AND (
store_products.user_type_id = '1'
OR store_products.user_type_id = '0' )
AND products_description.site_language_id = '1'
AND store_products_description.site_language_id = '1'
AND (
match (
CASE
WHEN store_products_description.products_title IS NOT NULL
AND store_products_description.products_title!='' THEN store_products_description.products_title
ELSE products_description.products_title
END AS products_title) against ('bu*' IN boolean mode)
OR match (
CASE
WHEN store_products_description.product_description IS NOT NULL
AND store_products_description.product_description!='' THEN store_products_description.product_description
ELSE products_description.product_description
END AS product_description) against ('bu*' IN boolean mode)
OR match (
CASE
WHEN store_products_description.long_description IS NOT NULL
AND store_products_description.long_description!='' THEN store_products_description.long_description
ELSE products_description.long_description
END AS long_description) against ('bu*' IN boolean mode)
OR match (product_settings.setting_value) against ('bu*' IN boolean mode)
OR match (products_additional_option_description.title) against ('bu*' IN boolean mode)
OR match (products_sizes.size_title) against ('bu*' IN boolean mode)
OR match (product_category_description.category_name) against ('bu*' IN boolean mode))
AND store_products.store_id = '3'
GROUP BY products.products_id
ORDER BY (rel_products_description_products_title*7) +(rel_product_settings_setting_value*6) +(rel_products_description_product_description*5) +(rel_products_description_long_description*4) +(rel_products_additional_option_description_title*3) +(rel_products_sizes_size_title*2) +(rel_product_category_description_category_name*1) DESC
错误：＃1064 - 您的SQL语法出错;查看与您的MySQL服务器版本相对应的手册，以便在'（第6行的情况下使用商店_产品说明。产品编号'）中使用正确的语法
答案 0 :(得分：1)
您会混淆标识符和表达式。
MATCH() takes a comma-separated list that names the columns to be searched。
CASE WHEN expression THEN column是一个表达式，当计算的表达式为true时，它返回列的值。
MATCH()看起来像一个函数，但它没有评估每一行的列值，因为它似乎正在做。它使用列名作为标识符传递给最完整的引擎。
编写查询的逻辑上正确的方法是相对于上面编写方式的内向外：
WHERE ...
AND CASE WHEN condition1 THEN MATCH(col1) AGAINST...
WHEN condition 2 THEN MATCH(col2) AGAINST ...
ELSE MATCH(col3) AGAINST ... END
AND ...
换句话说，当condition1为true时，WHERE子句应该评估与col1的匹配是否是命中等的真实性。
然后，CASE表达式应该根据该行的相应匹配结果为每一行返回true，从而为您提供预期的结果。
我强调＆＃34;应该。＆＃34;
这在逻辑上是正确的，不使用全文的标签，我还没有机会验证。由于全文搜索在整个表上运行，无论如何，并且要求服务器过滤掉其他谓词排除的行，因此这种查询的性能也会很有趣。
答案 1 :(得分：0)
尝试替换所有匹配（）
match (CASE WHEN store_products_description.products_title IS NOT NULL
AND store_products_description.products_title!='' THEN
store_products_description.products_title
ELSE products_description.products_title
END AS products_title) against ('bu*' IN boolean mode)
使用
match (CASE WHEN store_products_description.products_title IS NOT NULL
AND store_products_description.products_title!='' THEN
store_products_description.products_title
ELSE products_description.products_title
END ) against ('bu*' IN boolean mode)
在match()内提供别名可能会导致问题。希望这会有所帮助