How to change a value in a column on a SQLite database? -

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i have sqlite database format:

table users     |     |---------name - text     |     |---------avatar - text     |     |---------password - text     |     |---------userdir - text     |     |---------role - numeric

i want change number of role. how change it? (i mean, query?)

i'm using php if needs it. thanks!

update users set role=99 name='fred'

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