SELECT [TRANSACTION transaction]
[DISTINCT | ALL]
{* | <val> [, <val> …]}
[INTO :var [, :var …]]
FROM <tableref> [, <tableref> …]
[WHERE <search_condition>]
[GROUP BY col [COLLATE collation] [, col [COLLATE collation] …]
[HAVING <search_condition>]
[UNION <select_expr> [ALL]]
[PLAN <plan_expr>]
[ORDER BY <order_list>]
[FOR UPDATE [OF col [, col …]]];
<val> = {
col [<array_dim>] | :variable
| <constant> | <expr> | <function>
| udf ([<val> [, <val> …]])
| NULL | USER | RDB$DB_KEY | ?
} [COLLATE collation] [AS alias]
<array_dim> = [[x:]y [, [x:]y …]]
<constant> = num | 'string' | charsetname 'string'
<function> = COUNT (* | [ALL] <val> | DISTINCT <val>)
| SUM ([ALL] <val> | DISTINCT <val>)
| AVG ([ALL] <val> | DISTINCT <val>)
| MAX ([ALL] <val> | DISTINCT <val>)
| MIN ([ALL] <val> | DISTINCT <val>)
| CAST (<val> AS <datatype>)
| UPPER (<val>)
| GEN_ID (generator, <val>)
<tableref> = <joined_table> | table | view | procedure
[(<val> [, <val> …])] [alias]
<joined_table> = <tableref> <join_type> JOIN <tableref>
ON <search_condition> | (<joined_table>)
<join_type> = [INNER] JOIN
| {LEFT | RIGHT | FULL } [OUTER]} JOIN
<search_condition> = <val> <operator> {<val> | (
<select_one>)}
| <val> [NOT] BETWEEN <val> AND <val>
| <val> [NOT] LIKE <val> [ESCAPE <val>]
| <val> [NOT] IN (<val> [, <val> …] | <select_list>)
| <val> IS [NOT] NULL
| <val> {>= | <=}
| <val> [NOT] {= | < | >}
| {ALL | SOME | ANY} (<select_list>)
| EXISTS (<select_expr>)
| SINGULAR (<select_expr>)
| <val> [NOT] CONTAINING <val>
| <val> [NOT] STARTING [WITH] <val>
| (<search_condition>)
| NOT <search_condition>
| <search_condition> OR <search_condition>
| <search_condition> AND <search_condition>
<operator> = {= | < | > | <= | >= | !< | !> | <> | !=}
<plan_expr> =
[JOIN | [SORT] [MERGE]] ({<plan_item> | <plan_expr>}
[, {<plan_item> | <plan_expr>} …])
<plan_item> = {table | alias}
{NATURAL | INDEX (<index> [, <index> …])| ORDER <index
>}
<order_list> =
{col | int} [COLLATE collation]
[ASC[ENDING] | DESC[ENDING]]
[, <order_list> …]