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Jun 4, 2025
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docs(v4.4): update SQL syntax examples and table descriptions #126

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136 changes: 48 additions & 88 deletions CN/modules/ROOT/pages/v4.4/8.adoc
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Original file line number Diff line number Diff line change
Expand Up @@ -2024,50 +2024,53 @@ create table tb_test1(id int, flg char(10));

alter table tb_test1 add (name varchar);

alter table tb_test1 add (adress varchar, num int, flg1 char);
ALTER TABLE tb_test1
ADD adress varchar,
ADD num int,
ADD flg1 char;

\d tb_test1
Table "public.tb_test1"
Column | Type | Collation | Nullable | Default
--------+-------------------+-----------+----------+---------
id | integer | | |
flg | character(10) | | |
name | character varying | | |
adress | character varying | | |
num | integer | | |
flg1 | character(1) | | |
Table "public.tb_test1"
Column | Type | Collation | Nullable | Default
--------+-----------------+-----------+----------+---------
id | pg_catalog.int4 | | |
flg | char(10) | | |
name | varchar2(4000) | | |
adress | varchar2(4000) | | |
num | pg_catalog.int4 | | |
flg1 | char(1) | | |

MODIFY:
create table tb_test2(id int, flg char(10), num varchar);

insert into tb_test2 values('1', 2, '3');

alter table tb_test2 modify(id char);
ALTER TABLE tb_test2 ALTER COLUMN id TYPE char;

\d tb_test2
Table "public.tb_test2"
Column | Type | Collation | Nullable | Default
--------+-------------------+-----------+----------+---------
id | character(1) | | |
flg | character(10) | | |
num | character varying | | |
Table "public.tb_test2"
Column | Type | Collation | Nullable | Default
--------+----------------+-----------+----------+---------
id | char(1) | | |
flg | char(10) | | |
num | varchar2(4000) | | |

DROP:
create table tb_test3(id int, flg1 char(10), flg2 char(11), flg3 char(12), flg4 char(13),
flg5 char(14), flg6 char(15));

alter table tb_test3 drop column(id);
ALTER TABLE tb_test3 DROP id;

\d tb_test3
Table "public.tb_test3"
Column | Type | Collation | Nullable | Default
--------+---------------+-----------+----------+---------
flg1 | character(10) | | |
flg2 | character(11) | | |
flg3 | character(12) | | |
flg4 | character(13) | | |
flg5 | character(14) | | |
flg6 | character(15) | | |
Table "public.tb_test3"
Column | Type | Collation | Nullable | Default
--------+----------+-----------+----------+---------
flg1 | char(10) | | |
flg2 | char(11) | | |
flg3 | char(12) | | |
flg4 | char(13) | | |
flg5 | char(14) | | |
flg6 | char(15) | | |
```

=== 删除表
Expand Down Expand Up @@ -2103,12 +2106,10 @@ DELETE [ FROM ] [ ONLY ] table_name [ * ] [ [ AS ] alias ]
```undefined
create table tb_test4(id int, flg char(10));

insert into tb_test4 values(1, '2'), (3, '4'), (5, '6');
insert into tb_test4 values(1, '2'), (5, '6');

delete from tb_test4 where id = 1;

delete tb_test4 where id = 3;

table tb_test4;
id | flg
----+------------
Expand Down Expand Up @@ -2192,12 +2193,13 @@ ERROR: column "students.student_name" must appear in the GROUP BY clause or be
==== 示例

```undefined
select null union select null union select 1.2;
?column?
----------
1.2

SELECT 100 AS value FROM DUAL UNION SELECT 200 AS value FROM DUAL UNION SELECT 100 AS value FROM DUAL;
value
-------
100
200
(2 rows)

```

=== Minus Operator
Expand Down Expand Up @@ -2430,12 +2432,6 @@ select next_day('2020-07-01 19:43:51 +8'::timestamptz, 1) from dual;
---------------------
2020-07-05 19:43:51
(1 row)

select next_day(oracle.date '2020-09-15 12:13:29', 6) from dual;
next_day
---------------------
2020-09-18 12:13:29
(1 row)
```

==== last_day
Expand Down Expand Up @@ -2466,12 +2462,6 @@ select last_day('2020-11-29 19:20:40 +08'::timestamptz) from dual;
---------------------
2020-11-30 19:20:40
(1 row)

select last_day('-0004-2-1 13:27:19'::oracle.date) from dual;
last_day
----------------------
-0004-02-29 13:27:19
(1 row)
```

==== add_months
Expand Down Expand Up @@ -2825,31 +2815,19 @@ TO_YMINTERVAL(str) 将输入参数 str 时间间隔转换为年到月范围内
select to_yminterval('P1Y-2M2D');
to_yminterval
---------------
10 mons
+000000000-10
(1 row)

select to_yminterval('P1Y2M2D');
to_yminterval
---------------
1 year 2 mons
(1 row)

select to_yminterval('-P1Y2M2D');
to_yminterval
------------------
-1 years -2 mons
(1 row)

select to_yminterval('-P1Y2M2D');
to_yminterval
------------------
-1 years -2 mons
+000000001-02
(1 row)

select to_yminterval('-01-02');
to_yminterval
------------------
-1 years -2 mons
to_yminterval
---------------
-000000001-02
(1 row)
```

Expand All @@ -2867,40 +2845,22 @@ TO_DSINTERVAL(str) 将输入参数 str 的时间间隔转换为天到秒范围

```undefined
select to_dsinterval('100 00 :02 :00');
to_dsinterval
-------------------
100 days 00:02:00
to_dsinterval
-------------------------------
+000000100 00:02:00.000000000
(1 row)

select to_dsinterval('-100 00:02:00');
to_dsinterval
---------------------
-100 days -00:02:00
to_dsinterval
-------------------------------
-000000100 00:02:00.000000000
(1 row)

select to_dsinterval(NULL);
to_dsinterval
---------------

(1 row)

select to_dsinterval('-P100D');
to_dsinterval
---------------
-100 days
(1 row)

select to_dsinterval('-P100DT20H');
to_dsinterval
---------------------
-100 days -20:00:00
(1 row)

select to_dsinterval('-P100DT20S');
to_dsinterval
---------------------
-100 days -00:00:20
(1 row)
```

==== TO_TIMESTAMP_TZ
Expand Down
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