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Overview
| Comment: | Make the "select-stmt" syntax diagram a closer fit to reality. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
0c43e7efb4f0924c42fc44a7a59bdfb1 |
| User & Date: | drh 2014-01-30 19:39:31 |
Context
|
2014-01-30
| ||
| 20:51 | Add the "factored-select-stmt" syntax diagram. Improve the way diagrams are hidden and shown. check-in: fac98d12ae user: drh tags: trunk | |
| 19:39 | Make the "select-stmt" syntax diagram a closer fit to reality. check-in: 0c43e7efb4 user: drh tags: trunk | |
| 17:41 | Fix FROM clause in the SELECT syntax diagrams. Also fix typos in the text. check-in: a115a033da user: drh tags: trunk | |
Changes
Changes to art/syntax/bubble-generator-data.tcl.
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/collation-name
{line {optx /database-name .}
{tailbranch /table-name /index-name}
}
}
}
select-stmt {
loop
{or
{stack
{opt {line WITH {opt RECURSIVE} {loop common-table-expression ,}}}
{line SELECT {or nil DISTINCT ALL}
{loop result-column ,}}
{optx FROM {or {loop table-or-subquery ,} join-clause}}
{optx WHERE expr}
{optx GROUP BY {loop expr ,} {optx HAVING expr}}
{optx ORDER BY {loop ordering-term ,}}
{optx LIMIT expr {optx {or OFFSET ,} expr}}
}
{line VALUES {loop {line ( {loop expr ,} )} ,}}
}
compound-operator
}
join-clause {
line
table-or-subquery
{opt {loop {line join-operator table-or-subquery join-constraint}}}
}
simple-select-stmt {
|
> > | | | < | | | | | < < | | | | > > > |
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/collation-name
{line {optx /database-name .}
{tailbranch /table-name /index-name}
}
}
}
select-stmt {
stack
{opt {line WITH {opt RECURSIVE} {loop common-table-expression ,}}}
{loop
{or
{stack
{line SELECT {or nil DISTINCT ALL}
{loop result-column ,}}
{optx FROM {or {loop table-or-subquery ,} join-clause}}
{optx WHERE expr}
{optx GROUP BY {loop expr ,} {optx HAVING expr}}
}
{line VALUES {loop {line ( {loop expr ,} )} ,}}
}
compound-operator
}
{optx ORDER BY {loop ordering-term ,}}
{optx LIMIT expr {optx {or OFFSET ,} expr}}
}
join-clause {
line
table-or-subquery
{opt {loop {line join-operator table-or-subquery join-constraint}}}
}
simple-select-stmt {
|
Changes to art/syntax/select-stmt.gif.
cannot compute difference between binary files
Changes to pages/lang.in.
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SELECT statement syntax as possible in a single diagram, as some readers find that helpful. Alternative syntax diagrams that break the syntax down into smaller chunks are shown elsewhere in this document. <p>Note that there are paths through the syntax diagrams that are not allowed in practice. Some examples: <ul> <li>An [ORDER BY] or [LIMIT] clause can only occur on the right-most SELECT of a [compound select]. <li>A [VALUES] clause can be the first element in a [compound SELECT] that uses a [WITH] clause, but a [simple SELECT] that consists of just a [VALUES] clause cannot be preceded by a [WITH] clause. <li>The [WITH] clause must occur on the first SELECT of a [compound SELECT]. It cannot follow a [compound-operator]. </ul> These and other similar syntax restrictions are described in the text. |
< < |
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SELECT statement syntax as possible in a single diagram, as some readers
find that helpful. Alternative syntax diagrams that break the syntax down
into smaller chunks are shown elsewhere in this document.
<p>Note that there are paths through the syntax diagrams that
are not allowed in practice. Some examples:
<ul>
<li>A [VALUES] clause can be the first element in a [compound SELECT]
that uses a [WITH] clause, but a [simple SELECT] that consists of
just a [VALUES] clause cannot be preceded by a [WITH] clause.
<li>The [WITH] clause must occur on the first SELECT of a [compound SELECT].
It cannot follow a [compound-operator].
</ul>
These and other similar syntax restrictions are described in the text.
|