INDEX_NAME, '` USING ', INDEX_TYPE )END,IF(UPPER(INDEX_NAME) = 'PRIMARY', CONCAT('PRIMARY KEY USING ', INDEX_TYPE ),CONCAT('UNIQUE INDEX `', INDEX_NAME, '` USING ', INDEX_TYPE))),'(', GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`') ORDER BY SEQ_IN_INDEX ASC SEPARATO...
/* Index is not used in both parts of the WHERE clause */ ... WHERE index=1 OR A=10 /* No index spans all rows */ ... WHERE index_part1=1 OR index_part2=10 1. 2. 3. 4. 5. 6. 有时MySQL不使用索引,即使有可用的索引。一种情形是当优化器估计到使用索引将需要MySQL访问表中的...
INDEX_NAME, '` USING ', INDEX_TYPE )END,IF(UPPER(INDEX_NAME) = 'PRIMARY', CONCAT('PRIMARY KEY USING ', INDEX_TYPE ),CONCAT('UNIQUE INDEX `', INDEX_NAME, '` USING ', INDEX_TYPE))),'(', GROUP_CONCAT(DISTINCT CONCAT('`', COLUMN_NAME, '`') ORDER BY SEQ_IN_INDEX ASC SEPARATO...
Re: Add index for mysql table with ndbcluster storage engine 832 urgen sherpa June 10, 2016 05:40AM Sorry, you can't reply to this topic. It has been closed. Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle an...
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### MySQL 1. Added support for INDEX statement in column definition - https://github.com/xnuinside/simple-ddl-parser/issues/253 2. **v1.5.0** ### Fixes 8 changes: 8 additions & 0 deletions 8 README.md Original file line numberDiff line numberDiff line change @@ -490,6 +490,14...
(col1, col2);" creates one index with two key parts. The key part is a reference to a column in the table, and for STRING/BINARY/TEXT/BLOB columns it is possible to only prefix a part of the column by specifying a prefix in parentheses after the column name; "CREATE INDEX idx1 ...
But on a different instance of the server installed with the default charset being UTF-8, the ALTER TABLE ADD INDEX command fails. In sql_table.cc when the routine compare_tables asks, for each field, is the new_field identical to the old_field (field->is_equal(new_field), on the ...
Add Index Summary - In this topic, we described about the below sections - Add Index Why to add index? How to add index? Note :-ALTER TABLE with ADD INDEX is supported by MYSQL but not in Oracle or SQL Server. If we try to execute on SQL, it throws an error....
add index Posted by:Adrian Cazan Date: November 25, 2010 07:20AM Hello, I'm trying to add an index to a table. ALTER TABLE T ADD INDEX(aaa); The err message is: 1121 table handler doesn't support NULL in given index. Please change column 'aaa' to be NOT NULL or use another ...