ANOVA stands for Analysis of Variance ... then there is plenty to learn. Understanding the F test is essential. This test ...

When you have more than two means to compare, an F test in PROC ANOVA or PROC GLM tells you whether the means are significantly different from each other, but it does not tell you which means differ ...

When comparing more than two means, an ANOVA F-test tells you whether the means are significantly different from each other, but it does not tell you which means differ from which other means.