For example, a computed column can have the definition: cost AS price * qty. The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or more operators. The expression can't be a subquery or contain alias data types. ...
For example, a computed column can have the definition: cost AS price * qty. The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or more operators. The expression cannot be a subquery or contain alias data types. ...
The scale integer specifies the number of digits to the right of the decimal point. It cannot be negative and cannot exceed the precision. The default is 0. FLOAT(integer) A single or double-precision floating-point number. If the specified length is in the range: 1 - 24, the number us...
There is an experimental environment variable TABLESCHEMA_PRESERVE_MISSING_VALUES which, if it is set, affects how data casting works. By default, missing values are resolved to None values. When this flag is set, missing values are passed through as it is. For example: missing_values.py ...
Eacharray-variable-namemust identify an array variable in the SQL routine. Eachcorrelation-nameis defined as a designator of the intermediate result table specified by the immediately precedingtable-reference. Any qualified reference to a column must use the exposed name. If the same table name or...
Thanks to Ananda Mahto for the extended email discussions and ideas on generating the variable column. melt.data.table also retains attributes wherever possible. Closes #702 and #993. Thanks to @richierocks for the report. .SDcols understands ! now, i.e., DT[, .SD, .SDcols=!"a"] ...
A symbol that is defined in the current component is protected if the symbol is visible in other components, but cannot be preempted. Any reference to such a symbol from within the defining component must be resolved to the definition in that component. This resolution must occur, even if a...
variablelookup dataLookup table associating glyphs with their properties. See below for details on how to interpret the lookup values. A lookup table is used to find the 16-bit property value associated with the particular glyph. This is how to interpret the lookup for each of the 5 lookup ...
After deleting a large part of aMyISAMorARCHIVEtable, or making many changes to aMyISAMorARCHIVEtable with variable-length rows (tables that haveVARCHAR,VARBINARY,BLOB, orTEXTcolumns). Deleted rows are maintained in a linked list and subsequentINSERToperations reuse old row positions. You can us...
The following shows the use of a wildcard to specify multiple tables. Note that theTARGETclause does not include thetabprefix before the wildcard. That specification would be invalid, because the wildcard would be resolved assales.tabtab1,sales.tabtab2, and so forth. ...