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2 Sell: An equity Put/Call Ratio lower than 075 (more calls are being bought) is a sell signal Less than 050 is a screaming sell 3 Hint: Look for a series of consecutive days of high or low Put/Call Ratios before taking action 4 Note: The buy and sell ratios are not actionable trades, but only guidelines Always use other indicators to confirm before buying or selling

If you start out with LEFT, you can continue to use LEFT along that path as more tables are added. If another table must be joined to the Production.ColorList table, the type of join to use depends on whether there will be any rows that don t match. Whether to use an OUTER or INNER JOIN down a new path is not dependent on the previous join.

Figure 16-2

Figuring out which columns belong in the GROUP BY clause in an aggregate query often aggravates T-SQL developers. The rule is that any column that is not part of an aggregate expression in the SELECT or ORDER BY clauses must be listed in the GROUP BY clause. That rule seems pretty simple, but I have seen many questions on forums about this very point. If a required column is missing from the GROUP BY clause, you will not get incorrect results you will get no results at all except for an error message. If extra columns are listed in the GROUP BY clause, no warning message will appear, but the results will probably not be what you intended. The results will be grouped at a more granular level than expected. I have even seen code that incorrectly included the aggregated column in the GROUP BY clause. The query in listing 10 is missing the GROUP BY clause.

Trader and author Martin Zweig has been credited with being the first to use the Put/Call Ratio to identify tops and bottoms by betting in the opposite direction Zweig introduced the ratio in a series of articles after using it to make several accurate market forecasts Although first launched in 1995, the CBOE added the equity Put/Call Ratio in 2003

SELECT COUNT(*), CustomerID FROM Sales.SalesOrderHeader Msg 8120, Level 16, State 1, Line 1 Column 'Sales.SalesOrderHeader.CustomerID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

can also create a signature via AppleScript by using a make new signature command and setting three properties:

Listing 11 contains a query that lists the count of orders by CustomerID. The query includes the order date in the GROUP BY clause so that the results do not make sense. Figure 7 shows that there are multiple rows for each CustomerID value.

The Put/Call Ratio is updated every 15 seconds by the CBOE The purpose behind this contrarian indicator is that put and call buyers are generally wrong about the market, especially at tops and bottoms Historically, retail speculators have a rather poor record of guessing market direction Although the Put/Call Ratio is constantly updated, it only flashes actionable signals a few times a year Like other sentiment indicators, this ratio excels when the market is at one extreme or another As speculators get more emotional, they ll buy loads of put options (because they think the market is going down) or loads of call options (because they think the market is going up)

name The name you want to give the signature content The text to use for the signature include in random false if you don t true if you want to include the signature in your random pool;

SELECT COUNT(*) AS CountOfOrders, CustomerID FROM Sales.SalesOrderHeader GROUP BY CustomerID, OrderDate ORDER BY CustomerID

Another issue to watch out for is including only the column in the GROUP BY clause when the column is used in an expression in the SELECT list. Say you want the results grouped by the year in which the orders were placed. If you leave the order date out of the GROUP BY clause, an error will result. If you add the column, the error goes away, but the results are not grouped as expected.

When you create a new signature like this, Entourage automatically sets the fourth property of the signature object, the read-only ID property, to the next unused integer in the signature-numbering sequence

By monitoring this crowd, you can get clues as when market tops or bottoms have been reached When emotions are at a peak, more than likely the market is due for a reversal This indicator has a pretty good record for calling tops and bottoms, but with some caveats

Summary