48 lines
2.1 KiB
MySQL
48 lines
2.1 KiB
MySQL
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-- https://dev.mysql.com/doc/refman/8.0/en/update.html
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/* UPDATE [LOW_PRIORITY] [IGNORE] table_reference
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SET assignment_list
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[WHERE where_condition]
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[ORDER BY ...]
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[LIMIT row_count]
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value:
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{expr | DEFAULT}
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assignment:
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col_name = value
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assignment_list:
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assignment [, assignment] ... */
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/* UPDATE [LOW_PRIORITY] [IGNORE] table_references
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SET assignment_list
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[WHERE where_condition] */
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UPDATE LOW_PRIORITY IGNORE t1 SET col1 = col1 + 1 WHERE age = 12 ORDER BY id DESC LIMIT 10;
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UPDATE LOW_PRIORITY t1 SET col1 = col1 + 1 WHERE age = 12 ORDER BY id DESC LIMIT 10;
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UPDATE IGNORE t1 SET col1 = col1 + 1 WHERE age = 12 ORDER BY id DESC LIMIT 10;
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UPDATE IGNORE t1 SET col1 = col1 + 1 WHERE age = 12 ORDER BY id DESC;
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UPDATE IGNORE t1 SET col1 = col1 + 1 ORDER BY id DESC LIMIT 10;
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UPDATE LOW_PRIORITY t1 SET col1 = col1 + 1 WHERE age = 12 LIMIT 10;
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UPDATE t1 SET col1 = col1 + 1 LIMIT 10;
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UPDATE t1 SET col1 = col1 + 1;
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UPDATE t1 SET col1 = col1 + 1;
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UPDATE t1 SET col1 = col1 + 1, col2 = col1;
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UPDATE t SET id = id + 1;
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UPDATE t SET id = id + 1 ORDER BY id DESC;
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UPDATE items,month SET items.price=month.price WHERE items.id=month.id;
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UPDATE items SET retail = retail * 0.9 WHERE id IN (SELECT id FROM items WHERE retail / wholesale >= 1.3 AND quantity > 100);
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UPDATE items, (SELECT id FROM items WHERE id IN (SELECT id FROM items WHERE retail / wholesale >= 1.3 AND quantity < 100)) AS discounted SET items.retail = items.retail * 0.9 WHERE items.id = discounted.id;
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UPDATE /*+ NO_MERGE(discounted) */ items, (SELECT id FROM items WHERE retail / wholesale >= 1.3 AND quantity < 100) AS discounted SET items.retail = items.retail * 0.9 WHERE items.id = discounted.id;
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UPDATE items, (SELECT id, retail / wholesale AS markup, quantity FROM items) AS discounted SET items.retail = items.retail * 0.9 WHERE discounted.markup >= 1.3 AND discounted.quantity < 100 AND items.id = discounted.id;
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UPDATE LOW_PRIORITY IGNORE t1 SET col1 = col1 + 1 WHERE age = 12;
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UPDATE LOW_PRIORITY t1 SET col1 = col1 + 1 WHERE age = 12;
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UPDATE IGNORE t1 SET col1 = col1 + 1 WHERE age = 12;
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UPDATE t1 SET col1 = col1 + 1 WHERE age = 12;
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