Index

In December, the Consumer Price Index for All Urban Consumers decreased 0.1 percent, seasonallyadjusted, and rose 6.5 percent over the last 12 months, not seasonally adjusted. The index for allitems less food and energy increased 0.3 percent in December (SA); up 5.7 percent over the year (NSA).

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This Spotlight presents consumer price indexes for groups of households at the lowest and highest end of the income distribution for urban households to examine how different spending patterns can change measures of inflation. read more

Index

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This is the stack level of the generated box in the current stacking context. The box also establishes a local stacking context. This means that the z-indexes of descendants are not compared to the z-indexes of elements outside this element.

The health dimension is assessed by life expectancy at birth, the education dimension is measured by mean of years of schooling for adults aged 25 years and more and expected years of schooling for children of school entering age. The standard of living dimension is measured by gross national income per capita. The HDI uses the logarithm of income, to reflect the diminishing importance of income with increasing GNI. The scores for the three HDI dimension indices are then aggregated into a composite index using geometric mean. Refer to Technical notes for more details.

Global CSISM enables organizations throughout the world to partner with ACSI and use its powerful, scientific methodology to create customer satisfaction indexes for their own national economies, as well as benchmark with other indexes adopting the ACSI methodology.

Most of our Search index is built through the work of software known as crawlers. These automatically visit publicly accessible webpages and follow links on those pages, much like you would if you were browsing content on the web. They go from page to page and store information about what they find on these pages and other publicly-accessible content in Google's Search index.

Google also provides a free toolset called Search Console that creators can use to help us better crawl their content. They can also make use of established standards like sitemaps or robots.txt to indicate how often content should be visited or if it shouldn't be included in our Search index at all.

In fact, we have multiple indexes of different types of information, which is gathered through crawling, through partnerships, through data feeds being sent to us and through our own encyclopedia of facts, the Knowledge Graph.

These many indexes mean that you can search within millions of books from major libraries, find travel times from your local public transit agency, or find data from public sources like the World Bank.

CREATE INDEX constructs an index on the specified column(s) of the specified relation, which can be a table or a materialized view. Indexes are primarily used to enhance database performance (though inappropriate use can result in slower performance).

The key field(s) for the index are specified as column names, or alternatively as expressions written in parentheses. Multiple fields can be specified if the index method supports multicolumn indexes.

An index field can be an expression computed from the values of one or more columns of the table row. This feature can be used to obtain fast access to data based on some transformation of the basic data. For example, an index computed on upper(col) would allow the clause WHERE upper(col) = 'JIM' to use an index.

When the WHERE clause is present, a partial index is created. A partial index is an index that contains entries for only a portion of a table, usually a portion that is more useful for indexing than the rest of the table. For example, if you have a table that contains both billed and unbilled orders where the unbilled orders take up a small fraction of the total table and yet that is an often used section, you can improve performance by creating an index on just that portion. Another possible application is to use WHERE with UNIQUE to enforce uniqueness over a subset of a table. See Section 11.8 for more discussion.

The expression used in the WHERE clause can refer only to columns of the underlying table, but it can use all columns, not just the ones being indexed. Presently, subqueries and aggregate expressions are also forbidden in WHERE. The same restrictions apply to index fields that are expressions.

Causes the system to check for duplicate values in the table when the index is created (if data already exist) and each time data is added. Attempts to insert or update data which would result in duplicate entries will generate an error.

Do not throw an error if a relation with the same name already exists. A notice is issued in this case. Note that there is no guarantee that the existing index is anything like the one that would have been created. Index name is required when IF NOT EXISTS is specified.

The optional INCLUDE clause specifies a list of columns which will be included in the index as non-key columns. A non-key column cannot be used in an index scan search qualification, and it is disregarded for purposes of any uniqueness or exclusion constraint enforced by the index. However, an index-only scan can return the contents of non-key columns without having to visit the index's table, since they are available directly from the index entry. Thus, addition of non-key columns allows index-only scans to be used for queries that otherwise could not use them.

It's wise to be conservative about adding non-key columns to an index, especially wide columns. If an index tuple exceeds the maximum size allowed for the index type, data insertion will fail. In any case, non-key columns duplicate data from the index's table and bloat the size of the index, thus potentially slowing searches. Furthermore, B-tree deduplication is never used with indexes that have a non-key column.

Currently, the B-tree, GiST and SP-GiST index access methods support this feature. In these indexes, the values of columns listed in the INCLUDE clause are included in leaf tuples which correspond to heap tuples, but are not included in upper-level index entries used for tree navigation.

The name of the index to be created. No schema name can be included here; the index is always created in the same schema as its parent table. The name of the index must be distinct from the name of any other relation (table, sequence, index, view, materialized view, or foreign table) in that schema. If the name is omitted, PostgreSQL chooses a suitable name based on the parent table's name and the indexed column name(s).

The name of the collation to use for the index. By default, the index uses the collation declared for the column to be indexed or the result collation of the expression to be indexed. Indexes with non-default collations can be useful for queries that involve expressions using non-default collations.Specifies whether for a unique index, null values should be considered distinct (not equal