索引失效类型有哪些

2025-02-26 11:29:49

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ORACLE MYSQL中join 字段类型不同索引失效的情况有哪些 - MySQL...

2 rows in set, 3 warnings (0.00 sec) Warning (Code 1739): Cannot use ref access on index 'id' due to type or collation conversion on field 'id' --虽然TESTJOIN2是被驱动表由于隐士转换索引用不到 possible_keys可以看出 Warning (Code 1739): Cannot use range access on index 'id' due to...
ORACLEMYSQL中join字段类型不同索引失效的情况有哪些-四川省创兴...

2 rows in set, 3 warnings (0.00 sec) Warning (Code 1739): Cannot use ref access on index 'id' due to type or collation conversion on field 'id' --虽然TESTJOIN2是被驱动表由于隐士转换索引用不到 possible_keys可以看出 Warning (Code 1739): Cannot use range access on index 'id' due to...