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Overview
| Comment: | Add documentation on the EXISTS expression. Ticket #1082. (CVS 2353) |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
76cacb4a39d2dd79a27624a8bd1ff65e |
| User & Date: | drh 2005-02-19 12:44:16.000 |
Context
|
2005-02-19
| ||
| 13:05 | Rework parts of the pragma documentation. Ticket #1081. (CVS 2354) (check-in: 25141d9e21 user: drh tags: trunk) | |
| 12:44 | Add documentation on the EXISTS expression. Ticket #1082. (CVS 2353) (check-in: 76cacb4a39 user: drh tags: trunk) | |
| 12:32 | Remove duplicate word from documentation. Ticket #1103. (CVS 2352) (check-in: c1fc0a8aa9 user: drh tags: trunk) | |
Changes
Changes to www/lang.tcl.
1 2 3 | # # Run this Tcl script to generate the lang-*.html files. # | | | 1 2 3 4 5 6 7 8 9 10 11 |
#
# Run this Tcl script to generate the lang-*.html files.
#
set rcsid {$Id: lang.tcl,v 1.84 2005/02/19 12:44:16 drh Exp $}
source common.tcl
if {[llength $argv]>0} {
set outputdir [lindex $argv 0]
} else {
set outputdir ""
}
|
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899 900 901 902 903 904 905 | <function-name> ( <expr-list> | STAR ) | <expr> ISNULL | <expr> NOTNULL | <expr> [NOT] BETWEEN <expr> AND <expr> | <expr> [NOT] IN ( <value-list> ) | <expr> [NOT] IN ( <select-statement> ) | <expr> [NOT] IN [<database-name> .] <table-name> | | | | 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 |
<function-name> ( <expr-list> | STAR ) |
<expr> ISNULL |
<expr> NOTNULL |
<expr> [NOT] BETWEEN <expr> AND <expr> |
<expr> [NOT] IN ( <value-list> ) |
<expr> [NOT] IN ( <select-statement> ) |
<expr> [NOT] IN [<database-name> .] <table-name> |
[EXISTS] ( <select-statement> ) |
CASE [<expr>] LP WHEN <expr> THEN <expr> RPPLUS [ELSE <expr>] END
} {like-op} {
LIKE | NOT LIKE
} {glob-op} {
GLOB | NOT GLOB
}
|
| ︙ | ︙ | |||
1017 1018 1019 1020 1021 1022 1023 | statement does not define a real column with the same name. Row keys act like read-only columns. A row key can be used anywhere a regular column can be used, except that you cannot change the value of a row key in an UPDATE or INSERT statement. "SELECT * ..." does not return the row key.</p> <p>SELECT statements can appear in expressions as either the | | > > | > > > > | | | > | 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 | statement does not define a real column with the same name. Row keys act like read-only columns. A row key can be used anywhere a regular column can be used, except that you cannot change the value of a row key in an UPDATE or INSERT statement. "SELECT * ..." does not return the row key.</p> <p>SELECT statements can appear in expressions as either the right-hand operand of the IN operator, as a scalar quantity, or as the operand of an EXISTS operator. As a scalar quantity or the operand of an IN operator, the SELECT should have only a single column in its result. Compound SELECTs (connected with keywords like UNION or EXCEPT) are allowed. With the EXISTS operator, the columns in the result set of the SELECT are ignored and the expression returns TRUE if one or more rows exist and FALSE if the result set is empty. If no terms in the SELECT expression refer to value in the containing query, then the expression is evaluated once prior to any other processing and the result is reused as necessary. If the SELECT expression does contain variables from the outer query, then the SELECT is reevaluated every time it is needed.</p> <p>When a SELECT is the right operand of the IN operator, the IN operator returns TRUE if the result of the left operand is any of the values generated by the select. The IN operator may be preceded by the NOT keyword to invert the sense of the test.</p> <p>When a SELECT appears within an expression but is not the right |
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