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Document use of partial indexes for partial unique constraints

Report by Tomáš GreifBackpatch through 9.4

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Original file line number	Diff line number	Diff line change
`@@ -546,7 +546,9 @@ CREATE TABLE products (`
`546`	`546`
`547`	`547`	`<para>`
`548`	`548`	`Adding a unique constraint will automatically create a unique btree`
`549`		`- index on the column or group of columns used in the constraint.`
	`549`	`+ index on the column or group of columns used in the constraint.`
	`550`	`+ A uniqueness constraint on only some rows can be enforced by creating`
	`551`	`+ a <link linkend="indexes-partial">partial index</link>.`
`550`	`552`	`</para>`
`551`	`553`
`552`	`554`	`<indexterm>`

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