uml - What does I1, I2, U1, means in Visio database relationship diagram? -

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i reverse engineering database create database er diagram in visio. when display table in visio, on left hand side of entity diagram, see symbols next column names not know mean. symbols such as, u1, u2, l1, l2, l5...etc. others symbols such pk (primary key) , fk (foreign key) shown in same area, make sense me.

these other types of indexes.

u1 = unique index 1..... i1 = index 1......

here examples in sql server http://msdn.microsoft.com/en-us/library/ms188783.aspx


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