mysql alter table add index if not exists

Summary

The CREATE INDEX statement in MySQL 8.0 and 5.7 allows users to add indexes to existing tables. 1 2 It supports prefix lengths for CHAR, VARCHAR, BINARY, and VARBINARY key parts 1 2 , and can be used to create multi-valued indexes on JSON columns. 1 Additionally, the CREATE INDEX statement can be used to create a primary key for a table 1 , and the index_part_length and index_values options can be used to specify the index prefix length. 2

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1 dev.mysql.com 2 dev.mysql.com


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Summary The CREATE INDEX statement in MySQL 8.0 allows users to add indexes to existing tables. It can be used to create multi-valued indexes on JSON columns, and can be used to specify prefix lengths for string, VARCHAR, BINARY, and VARBINARY key parts. Additionally, the CREATE INDEX statement can be used to create a primary key for a table, and the index can be used to create a multi-valued index on a JSON column.
MySQL :: MySQL 8.0 Reference Manual :: 13.1.15 CREATE INDEX Statement
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| ADD SPATIAL [INDEX|KEY] [index_name] (index_col_name,...) [index_option] ... | ADD [CONSTRAINT [symbol]] FOREIGN KEY [IF NOT EXISTS] [index_name] ...
ALTER TABLE - MariaDB Knowledge Base
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Summary The CREATE INDEX statement in MySQL 5.7 allows users to add indexes to existing tables. It supports prefix lengths for CHAR, VARCHAR, BINARY, and VARBINARY key parts, and can be used to create multiple-column indexes. The index can be used to store index values in ascending order, and the index_part_length and index_values options can be used to specify the index prefix length.
MySQL :: MySQL 5.7 Reference Manual :: 13.1.14 CREATE INDEX Statement
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Hello everyone, i`m not really new to Mysql but I´m having trouble with a ALTER TABLE statement. All I want to do is to add an index to an existing Table. The ...
MySQL :: ADD INDEX to Table if not exists
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Is there a way to create an index in MySQL if it does not exist? MySQL does not support the obvious format:
MySQL: Create index If not exists? – Stack All Flow
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Create an index on one or more columns. ... CREATE INDEX is mapped to an ALTER TABLE statement to create indexes . See ALTER TABLE . CREATE INDEX cannot be ...
CREATE INDEX - MariaDB Knowledge Base
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For descriptions of all table options, see Section 13.1.18, “CREATE TABLE Statement” . However, ALTER TABLE ignores DATA DIRECTORY and INDEX DIRECTORY when ...
MySQL :: MySQL 5.7 Reference Manual :: 13.1.8 ALTER TABLE Statement
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use the MySQL UNIQUE index to prevent duplicate values in one or more column in a table ... add a unique constraint to an existing table, you can use the ALTER ...
Using MySQL UNIQUE Index To Prevent Duplicates
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If you use CHANGE or MODIFY to shorten a column for which an index exists on the column, and the resulting column length is less than the index length, MySQL ...
MySQL :: MySQL 8.0 Reference Manual :: 13.1.9 ALTER TABLE Statement
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For descriptions of all table options, see Section 13.1.17, “CREATE TABLE Statement” . However, ALTER TABLE ignores DATA DIRECTORY and INDEX DIRECTORY when ...
MySQL :: MySQL 5.6 Reference Manual :: 13.1.7 ALTER TABLE Statement
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CREATE INDEX cannot be used to create a PRIMARY KEY ; use ALTER TABLE instead. For more information about indexes, see Section 7.4.4, “How MySQL Uses ...
MySQL :: MySQL 5.1 Reference Manual :: 12.1.13 CREATE INDEX Syntax
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CREATE INDEX cannot be used to create a PRIMARY KEY ; use ALTER TABLE instead. For more information about indexes, see Section 8.3.1, “How MySQL Uses ...
MySQL :: MySQL 5.6 Reference Manual :: 13.1.13 CREATE INDEX Statement
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