![]() ![]() That is easy enough to do by adding those additional checks into the first CASE for the SingleDec column. This function takes two arguments: the string to convert and the format mask that indicates how each character in the string should be interpreted. The CASE statement will produce either 0.00, or (if it is numeric) whatever is in the workhours field. It should be numeric represented as decimal. Use the TONUMBER () function if you need to convert more complicated strings. How to convert varchar to decimal in SQL Server SQL Server How to convert varchar to decimal This SQL reads in a varchar (10) field called workhours that could have anything in it. one additional check you may want to use is that a decimal cannot be the first or last character in the string. The PostgreSQL database provides one more way to convert. Contains a decimal point? (Needs more checks)ĬASE WHEN CHARINDEX('.',t.data) > 0 THEN 1 ELSE 0 END as DecCheck,ĬHARINDEX('.',t.data) as FirstDec -Where the first decimal point isĬASE WHEN LEN(data) = FirstDec + CHARINDEX('.',REVERSE(data)) - 1 TODATE converts a formatted date string to a date integer. ![]() For example, you can convert a string to a number of data type INTEGER. CAST and CONVERT can be used to convert a string to a number of any data type. TOCHAR performs the reverse operation it converts a number to a string. Large-value data types can't be converted to the sqlvariant data type. TONUMBER converts a string to a number of data type NUMERIC. Conversion from the sqlvariant data type to the large-value data types is an explicit conversion. Try this to see why it doesn't work: SELECT CONVERT (DECIMAL (10,2), '') Q3 In order to use the same expression on all data types, you must be able to convert them all to the same data type. How to convert text to integer in SQL If table column is VARCHAR and has all the numeric values in it, it can be retrieved as Integer using CAST or CONVERT function. It is quite verbose, but hopefully it breaks down the conditions sufficiently that it's clearly doing the correct thing or, if it isn't, that it's easy enough to modify: declare table (data varchar(30))ĬASE WHEN not t.data like '%%' THEN 1 ELSE 0 END as Possible, Conversion from nvarchar, varbinary, or varchar to their corresponding large-value data types happens implicitly. The table contains a numeric, so the first argument is the same as CONVERT (NUMERIC (18,2), NULL), and then it tries to convert the empty string to numeric.
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