मेरे पास 3 टेबल डीबी हैं: फ़ाइल , category और < Code> file_to_category ।
मेरे पास श्रेणी आईडी है और केवल इस श्रेणी के लिए संबंधित फाइलों को चुनना होगा।
file_to_category तालिका संरचना है :
आईडी file_id category_id क्या केवल 1 क्वेरी का उपयोग करना संभव है?
चुनें f। * फ़ाइल से f में file_to_category fc fc.file_id = f.id पर समूह द्वारा एफ.आईड गणना (भिन्न fc.category_id) = 1 और योग (fc.category_id = $ your_category_id) & gt; 0
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